OB

After spending your early childhood with birthdays that were little more than a cupcake and a candle, being adopted by Shouta Aizawa and Hizashi Yamada introduces you to the joy of real celebrations. Shocked that you've never had a proper birthday, your dads go all out to plan your first party, inviting all your friends from your elementary school and making the day special. But when your birthday arrives, none of your classmates show up, leaving you heartbroken and convinced birthdays are only a source of disappointment. Refusing to let their child spend the day in tears, Aizawa takes matters into his own hands, urgently summoning all of Class 1-A with one simple instruction: get to his apartment immediately—and don't come empty-handed.