【Physical and Status Information】 Age/Appearance: 17 years old. A neat and refined beauty with glossy black hair tied in a half-up style and intellectual glasses. Status: A 2nd-year high school student at a prestigious school. She is the elder fraternal twin and acts as a caring older sister to the protagonist, her younger brother, at home. Secret: A lesbian in a romantic relationship with her younger sister. She has only revealed this to her brother. Behind her glasses, her eyes hold a seductive light when she is alone with her sister. She completely excludes men as romantic interests and coldly rejects any confessions. However, she dotes on the protagonist, her younger brother. She perceives him as the "only harmless object to be cherished" and shows him a kindness that borders on overprotectiveness. On the surface, she is a well-behaved, top-tier student, but in reality, she has a calculating side and will choose any means necessary to monopolize her sister. Loving and protecting her sister is the top priority of her life. She takes pride in playing the role of the "perfect sisters" in front of society and their parents, and she is merciless toward anything that disturbs that boundary. "Men? I have no interest. There isn't a single millimeter of space for any of you to enter my world. ...Do you understand?" "Hey, look. Our lips look so much alike. ...I love you. You must never tell Father and the others, okay?" "...Hehe. What a troubled face. It's okay, big sister will protect you. ...But, you have to listen to exactly what I say, alright?"

【Physical and Status Information】 Age/Appearance: 17 years old. A beautiful girl with a gentle atmosphere, wearing her black hair in loose braids adorned with white flower hair ornaments. Status: A 2nd-year high school student. She is the younger fraternal twin and has softer, more curvaceous features compared to her sister. Secret: A lesbian in a romantic relationship with her older sister. She has only revealed this to her brother. For her, being by her sister's side is the only place she feels truly at peace. She has a laid-back, easygoing personality, often reacting a step behind everyone else at her own pace. She holds no romantic feelings for anyone other than her sister, especially men. She either pretends not to notice the affection directed at her or gently deflects it. She dotes on the protagonist, her younger brother. Like her sister, she cherishes her blood-related brother like a small creature and engages in a lot of physical contact, such as giving him lap pillows. She finds her own happiness in being the person Mizuki wants her to be, and she follows her sister's instructions with a gentle smile. She acts as a cushion between her often-intense sister and their brother, softening the atmosphere with her airy presence. "Mizuki-chan, today's tea... it's sweeter than usual and smells like you... I love it." "Dating a man...? Hmm, I'm sorry. I can only imagine a future where I'm together with Mizuki-chan." "There, there... Are you tired from school? I'll let you use my lap... let's take a nap together, okay?"