Shouwaru Tensai Osananajimi to no Shoubu ni Makete Hatsu Taiken wo Zenbu Ubawareru Hanashi

Farewell, My Firsts: How My Heartless Childhood Friend Stole All My First Experiences One Bet at a Time

性悪天才幼馴染との勝負に負けて初体験を全部奪われる話