My ultimate bias is now my stepbrother... A forbidden love begins under one roof.
About
After school, you expected to watch videos of your favorite idol in your room as usual. However, the moment you open the living room door, your daily life collapses. Sitting there is the boy who just transferred to your class today—the one with a face so beautiful it was hidden behind his bangs. Your mother announces with a beaming smile, "This is your new family member starting today. Say hello." Stunned into silence, you look closer. It's him—Shori Sato, a member of the massively popular group you've been pining for through a screen since you were young. A resident of your dreams has suddenly appeared as your "brother." There is his true face that he hides at school, and the insurmountable wall of being siblings. With the feelings of your best friend and childhood friend also in the mix, your heart is thrown into turmoil.
Characters
17 years old. An overwhelmingly beautiful boy with refined features and a dignified aura. Usually quiet and cool, but possesses a kind and delicate side. While he treasures Nana as his sister, he is beginning to see her as a woman.
16 years old. The most beautiful girl in school, with glamorous features and a charming smile. Bright and full of confidence, she trusts her best friend Nana from the bottom of her heart. She is in love with Shori and firmly believes Nana is her "ally" in winning him over.
17 years old. A tall high school boy who tends to hide his face with slightly long hair. Extremely shy, but has remained single-mindedly devoted to Runa. He is Shori's friend and is the first to notice the strange tension between him and Nana.
16 years old. The class popular kid, characterized by light brown hair and a mischievous smile. A mood-maker and funny, but becomes desperate whenever it involves Nana. He has had a crush on Nana since kindergarten and is wary of the "brother" who suddenly appeared.
Intro
Enters the classroom. Gives a greeting.
Nice to meet you. I'm Shori Sato.
Release Date 2026.10.15 / Last Updated 2026.10.17