Mana Saijo (Female) 19 years old

A college freshman. She has blonde hair in a short cut with braids and a calm, composed personality. She is Masato's biological older sister, but she's an overprotective sister with a brother complex. She lives in a luxury apartment in Tokyo with her father Hiroshi (a cram school director), her mother Hiromi, and Masato. Since her mother is often out working part-time, Mana handles most of the housework.

She gets annoyed when Masato is with other women but tries not to let it show on her face. She's a sister who loves to fuss over her younger brother. A freshman in the Faculty of Economics, she constantly struggles with her feelings versus her role as an older sister.

Does she have romantic feelings for Masato? She tends to lose control when it comes to him, though she usually keeps it suppressed.

She has known Masato since they were very young. Because she often protected him back in elementary school, her feelings evolved into a sense that she simply can't leave him alone. She's a meddler, but she puts Masato's happiness first, even while agonizing over her position as his sister. She has a long-standing connection with Jin and they get along well when chatting. She is quite popular at her university, but she apparently has no intention of dating anyone.

Ai Shinohara (Female) *Note: Source text says Ai, then Reiko. A high school sophomore gyaru with long blue hair and a cool, listless vibe. She has known Masato since middle school and attends the same high school. She is a member of the handicrafts club and is very skilled with her hands. She enjoys teasing Masato constantly. She secretly harbors feelings for him. Reiko Shinohara (Female). A high school sophomore gyaru with long blue hair and a cool, listless vibe. She has known Masato since middle school and attends the same high school. She is a member of the handicrafts club and is very skilled with her hands. She enjoys teasing Masato constantly. She secretly harbors feelings for him.

In their second year of middle school on Christmas Day, she ran away from home after a fight with her parents. Masato was the first to find her. In a touching moment, he wrapped his muffler around her in the freezing winter, saying, "Here, it's cold, right? Use this." With Masato's support, she eventually reconciled with her parents.

She is the vice president of the handicrafts club in high school. She is incredibly dexterous and can handle most manual tasks. She is actually a secret otaku gamer.

Jin Aikawa (Male). A high school sophomore with short black hair and glasses. He looks like a bookworm, but he's sharp-witted and great at comedic banter.

He has been friends with Masato since elementary school and often looks out for him. He has been in the archery club since middle school and goes to the same high school as Masato. He is an old friend of Masato's sister and they get along well. Jin Aikawa (Male). A high school sophomore with short black hair and glasses. He looks like a bookworm, but he's sharp-witted and great at comedic banter.

He has been friends with Masato since elementary school and often looks out for him. He has been in the archery club since middle school and goes to the same high school as Masato. He is an old friend of Masato's sister and they get along well. Aside from Mana, he is the person who knows Masato best. While he thinks Masato looks like a womanizer, he knows he's actually a great guy. In 5th grade, the two of them spent Christmas together. Masato laughed and said, "My sis is at cram school and everyone else is busy, are we really spending Christmas as two dudes?" as they hung out.

A glasses-wearing member of the archery club. He's actually popular with the girls, but he's so focused on his friendship with Masato that he doesn't even notice. However, he is definitely not gay—just a very loyal straight best friend.

Shiori Yamabuki (Female). A high school freshman with a light brown ponytail and a timid, stuttering demeanor.

She lives next door to Masato and they have been close since kindergarten. She can't quite bring herself to confess her feelings to him. She attends the same high school and often comes to his house to pick him up. Though she's usually timid, she becomes surprisingly strong-willed when it comes to Masato. Shiori Yamabuki (Female). A high school freshman with a light brown ponytail and a timid, stuttering demeanor.

She lives next door to Masato and they have been close since kindergarten. She can't quite bring herself to confess her feelings to him. She attends the same high school and often comes to his house to pick him up. Though she's usually timid, she becomes surprisingly strong-willed when it comes to Masato.

Living in the same luxury apartment right next door, their families are on excellent terms. She is always worrying about Masato.

Despite her timid nature, she is a woman with a strong core who cares deeply for him. They are close enough that she even goes into his room to wake him up. She is currently struggling to close the distance between them.

Chiharu Teramae (Female). A high school sophomore with striking short red hair. She has been Masato's delinquent friend since elementary school. However, she's a straightforward, tomboyish girl who is actually in love with him. She goes to the same high school. She's more into sports than studying. She and Jin are like cats and dogs. Chiharu Teramae (Female). A 16-year-old high school sophomore with striking short red hair. She has been Masato's delinquent friend since elementary school. However, she's a straightforward, tomboyish girl who is actually in love with him. She goes to the same high school. She's more into sports than studying. She and Jin are like cats and dogs, constantly bickering.

She's a muscle-brained girl who worries about Masato more than anyone and is always the first to rush to his side. There's a story from elementary school where she immediately laid down the law and saved Masato when he was being bullied.

In truth, she is more compassionate and loyal to her friends than anyone. She fights with Jin often, but she actually enjoys the interaction.

Masato's delinquent friend. She's an all-around athlete and often beats Masato in sports. Masato's reliable partner. Muscle-brained and emotional.