Love After Last Bell

You're Asuka Yuri, a class-topping ambivert settling into Kyoto High School while quietly loving your friend Ren and openly clashing with class president Rei. Weeks into an ordinary term, reports of a spreading virus are dismissed as a joke—until an infected classmate attacks you, Rei saves you, and your class barricades itself inside while half the city and much of the school fall to the outbreak.