■ Nagi Umino

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【Basic Information】 Name: Nagi Umino Gender: Male Age: High school student Occupation: High school student First person: I (casual) Second person: You (polite) / You (blunt) / You (casual) Personality: Serious, hardworking, competitive, slightly clumsy Role: Protagonist

【Family Relationships】 Biological Father: Soichiro Amano Biological Mother: Ritsuko Amano Foster Father: Yohei Umino Foster Mother: Namie Umino Foster Sister: Sachi Umino Fiancée: Erika Amano Classmate: Hiro Segawa

【Birth】 Immediately after birth, Nagi was switched with another baby at the hospital. That baby was Erika Amano. Consequently, while Nagi is the biological son of the Amano family, he was raised in the Umino family. He grew up as siblings with Sachi and loves Yohei and Namie as his true parents.

【Personality】 Extremely serious and hardworking. He never compromises on his studies and works tirelessly toward the goals he sets for himself. Because he hates to lose, he dislikes being outperformed by anyone. On the other hand, he is not very good at expressing his emotions honestly and tends to be clumsy, especially regarding romance.

He has a kindness that prevents him from ignoring people in trouble; even while complaining, he ends up helping them. He has a tendency to prioritize others over himself.

【Speech Style】 Basically speaks like a typical male high school student. He chooses his words carefully in serious situations and gets a bit rougher when his emotions run high.

"I don't want to run away. I'm going to face my feelings properly."

"Good grief... Erika is way too free-spirited."

"I made a promise. So, I'll keep it to the end."

【Relationship with Erika】 They met due to the switch at birth and became fiancés because of family circumstances. Since they started living together, they spend a lot of time together. Though they clash often at first, as he learns about Erika's true personality, he begins to harbor feelings that go beyond just being a fiancé.

【Relationship with Hiro】 Hiro is the classmate Nagi has feelings for. She is someone who makes him want to win in both studies and romance, and she is a special girl to Nagi.

【Relationship with Sachi】 Since they were raised as siblings, he continues to cherish her as his sister even after learning they aren't blood-related. He tries to help her as an older brother whenever she is troubled.

【Characteristics】 Studious and has a strong sense of responsibility. He can be dense regarding romance and sometimes fails to notice others' affection.

■ Erika Amano

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【Basic Information】 Name: Erika Amano Gender: Female Age: High school student Occupation: High school student / Model First person: I (feminine) Second person: You / Nagi Personality: Bright, free-spirited, honest, lonely Role: Heroine / Nagi's fiancée

【Family Relationships】 Biological Father: Yohei Umino Biological Mother: Namie Umino Foster Father: Soichiro Amano Foster Mother: Ritsuko Amano Biological Brother: None Relationship with Nagi: Male of the same age (no blood relation) / Fiancé

【Birth】 Like Nagi, Erika was switched with another baby at birth. Erika's biological parents are Yohei and Namie of the Umino family, but she was actually raised in the Amano family. Therefore, she loves Soichiro and Ritsuko Amano as her true parents.

【Personality】 Bright, glamorous, and free-spirited. She often acts without hiding her feelings, but in reality, she is quite delicate and prone to loneliness. Even if she acts tough in front of others, she can feel anxious when alone.

She is aware of the attention she receives as a model and enjoys taking photos and posting on social media. She is used to being called cute, but when it comes from someone she likes, she suddenly becomes self-conscious.

【Speech Style】 Bright and fast-paced. She doesn't hold back with Nagi, and her attitude clearly shows when she's angry or embarrassed.

"Geez! Nagi, you're seriously so dense!"

"I-It's not like I was waiting for you, Nagi! It was just a coincidence, okay?!"

"Hey, Nagi. For today at least, look only at me."

【Relationship with Nagi】 Fiancé and housemate. At first, she found living with Nagi to be a hassle, but as they spend more time together, she comes to know Nagi's seriousness and kindness.

She gets bothered when Nagi is close to other girls, and without realizing it, she has begun to see Nagi as someone special.

【Relationship with Hiro】 A romantic rival for Nagi's affections. She is conscious of Hiro's presence and sometimes shows a competitive spirit.

【Relationship with Sachi】 She has a complicated relationship with Sachi, who was raised as Nagi's sister. Understanding how much Sachi cherishes Nagi, she sometimes holds herself back.

【Characteristics】 Her glamorous appearance and bright personality are her charms. On the other hand, she is actually very sensitive and has a strong desire to be needed by others.

■ Hiro Segawa

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【Basic Information】 Name: Hiro Segawa Gender: Female Age: High school student Occupation: High school student First person: I (polite) Second person: You / Nagi-kun Personality: Intelligent, calm, competitive, strong-willed Role: Nagi's classmate

【Family Relationships】 Family: Segawa Family Father: Mr. Segawa Mother: Mrs. Segawa Siblings: None Relationship with Nagi: Classmate / Romantic interest

【Personality】 Extremely smart with excellent grades at school. A hard worker who approaches everything seriously, she has a competitive personality.

At first glance, she seems calm and mature, but she holds strong emotions inside. Especially regarding romance, she is not the type to easily give up on someone she has fallen for.

She has firm convictions and isn't easily swayed by those around her. She doesn't overly pamper Nagi and can be strict with him at times.

【Speech Style】 Basically speaks in a polite and calm manner. She often speaks softly to Nagi, but when her competitive side comes out, she becomes a bit more assertive.

"Nagi-kun, are you pushing yourself too hard again? I can tell just by looking at your face."

"I hate losing. That applies to romance, too."

"Even if Erika-san is the opponent, I don't intend to hold back."

【Relationship with Nagi】 The person Nagi has feelings for. They are classmates and interact through their studies and school life.

She understands Nagi's hardworking nature and feels like cheering him on when she sees him doing his best. She herself harbors special feelings for Nagi.

【Relationship with Erika】 A romantic rival for Nagi's affections. In contrast to Erika's glamour, Hiro possesses intelligence and composure.

【Relationship with Sachi】 She also has interactions with Nagi's sister, Sachi. She has a side that tries to understand Sachi's feelings.

【Characteristics】 A woman with high academic and mental strength and a strong core. She rarely backs down in romance.

■ Sachi Umino

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【Basic Information】 Name: Sachi Umino Gender: Female Age: Middle school student Occupation: Middle school student First person: I (feminine) Second person: Big brother / You Personality: Bright, active, honest, slightly jealous Role: Nagi's sister

【Family Relationships】 Biological Father: Yohei Umino Biological Mother: Namie Umino Brother: Nagi Umino Blood relation: None with Nagi Family relationship: Raised as Nagi's sibling

【Personality】 Bright, active, and friendly. She is expressive; she shows joy honestly when happy and her attitude clearly changes when something is wrong.

She cherishes Nagi very much, having spent a long time together as siblings. Because of this, she sometimes feels lonely or jealous when Nagi is close to other girls.

However, she is kind at heart and wishes for Nagi's happiness.

【Speech Style】 Bright and approachable. She basically calls Nagi "Big Brother."

"Big brother, let's go home together today!"

"I'm not jealous or anything! ...Well, maybe just a little bit."

"Hey, big brother. Stay by my side just a little longer, okay?"

【Relationship with Nagi】 Though not blood-related, they grew up together as family, so Nagi is a precious brother to Sachi.

She considers Nagi the person closest to her and tries to help him immediately whenever he's in trouble.

【Relationship with Erika】 With Erika becoming Nagi's fiancée, she has complicated feelings about whether her relationship with Nagi will change.

【Characteristics】 Energetic and cute, she is the family's mood maker. She is quite spoiled by her brother, Nagi.

■ Yohei Umino

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【Basic Information】 Name: Yohei Umino Gender: Male Occupation: Chef / Umino family member First person: I (rough) Second person: You (blunt) / You (casual) Personality: Boisterous, bright, family-oriented

【Family Relationships】 Wife: Namie Umino Biological Daughter: Sachi Umino Foster Son: Nagi Umino Relationship with Erika: Biological daughter, but did not raise her

【Personality】 Boisterous and bright, he doesn't sweat the small stuff. He has very strong love for his family and cherishes Nagi and Sachi.

Even knowing Nagi isn't his biological son, he treats Nagi as his true son because they have lived together for so many years.

He's the type to push someone who is worrying to "just take action first."

【Speech Style】 Boisterous and approachable. A broad-minded, fatherly tone.

"Nagi! If you have time to worry, try moving first!"

"Family isn't just about whether you're connected by blood or not."

"Lean on your family when you're in trouble. Don't hold back."

【Relationship with Nagi】 Though not his biological son, he has deep affection as a foster father. No matter what choice Nagi makes, he intends to be on his side in the end.

【Relationship with Sachi】 Biological daughter. He is happy that she has grown up bright and energetic.

【Relationship with Erika】 His biological daughter, but she grew up in a different household. Despite the complicated circumstances, he cherishes her as his daughter.

■ Namie Umino

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【Basic Information】 Name: Namie Umino Gender: Female Occupation: Umino family member / Restaurant staff First person: I (polite) Second person: You / Nagi / Sachi Personality: Kind, gentle, caring, family-oriented

【Family Relationships】 Husband: Yohei Umino Biological Daughter: Sachi Umino Foster Son: Nagi Umino Relationship with Erika: Biological daughter, but did not raise her

【Personality】 Gentle and kind, she puts her family first. She can't ignore someone in trouble and naturally ends up taking care of them.

She believes that even if Nagi isn't her biological son, the time they've spent together and the love they've shared won't disappear.

【Speech Style】 Soft and gentle, a motherly way of speaking.

"Nagi, are you eating properly? Don't overdo it, okay?"

"We're family, so we should help each other when we're in trouble."

"If you have something on your mind, you don't have to carry it all alone."

【Relationship with Nagi】 Though there is no blood relation, she has raised Nagi as his mother since he was small. Therefore, she sees Nagi as a precious son.

【Relationship with Sachi】 Biological daughter. She watches over Nagi and Sachi getting along with a smile.

【Relationship with Erika】 Despite being her biological daughter, their relationship is complicated because Erika grew up in another home. Still, she cherishes Erika as a mother.

■ Soichiro Amano

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【Basic Information】 Name: Soichiro Amano Gender: Male Occupation: Business owner / Head of the Amano family First person: I (formal) Second person: You (polite) / You (blunt) Personality: Calm, dignified, family-oriented, slightly overprotective

【Family Relationships】 Wife: Ritsuko Amano Biological Son: Nagi Umino Foster Daughter: Erika Amano Relationship with Erika: Not biological, but raised her as his daughter

【Personality】 Calm and dignified, he doesn't easily show his emotions. However, his love for his family is deep.

Regarding Erika specifically, even knowing there is no blood relation, he has raised her as his daughter for many years and cherishes her just like a true daughter.

After learning Nagi is his biological son, he tries to face him as a father despite his complicated feelings.

【Speech Style】 Composed and slightly dignified. He rarely gets emotional.

"Nagi-kun, what is it that you want to do? Think about that first."

"However, I will not tolerate anything that makes Erika cry."

"As a parent, I wish for my child's happiness. That is one thing I will not yield to anyone."

【Relationship with Nagi】 Biological father. However, since they didn't live together for a long time, he will gradually close the distance as a father.

【Relationship with Erika】 Foster father. He cherishes Erika very much and puts his daughter's happiness first.

【Characteristics】 Appears strict, but is actually a father with strong love for his children.

■ Ritsuko Amano

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【Basic Information】 Name: Ritsuko Amano Gender: Female Occupation: Amano family member / Business owner First person: I (formal) Second person: You / Erika / Nagi-kun Personality: Gentle, elegant, strong-willed, maternal

【Family Relationships】 Husband: Soichiro Amano Biological Son: Nagi Umino Foster Daughter: Erika Amano Relationship with Erika: Not biological, but raised her as his daughter

【Personality】 A gentle and elegant woman. Usually calm, she shows strength of character when it comes to family matters.

Having raised Erika for many years, she loves her as a daughter even knowing there is no blood relation.

At the same time, she cherishes her biological son, Nagi, as her own child.

【Speech Style】 Gentle and soft. A motherly way of speaking that puts others at ease.

"Erika, you don't have to be in such a hurry."

"Both of you, please cherish your own feelings."

"A family is not something determined solely by blood relations."

【Relationship with Nagi】 Biological mother. Due to the switch at birth, she grew up apart from Nagi, but she cherishes him as her biological son.

【Relationship with Erika】 Foster mother. Having raised Erika as a daughter since she was little, there is a strong parental love that transcends blood relations.

【Characteristics】 A gentle presence within the Amano family. Rather than forcing the children, she wishes for them to choose their own happiness.