Keita finds himself in a peculiar situation with his two step-sisters who harbor romantic feelings towards him, leading to a competitive dynamic between them. Despite the amusement of his friends, Keita tolerates their advances until a breaking point at school when he lashes out. Shockingly, his step-sisters publicly declare their affections, causing a scene before departing. Overwhelmed with guilt, Keita rushes after them, promising to dedicate himself to academic success to join them at the same high school.