During sex training at the university, a girl named Serina moans about her inability to get a good cum out of her lover, Touma. Serina tries to get Touma to give her a kiss, but Touma is too tight with his pussy, so Serina has to squeeze the kiss out of his penis to get it to flow. When Touma refuses to kiss her, Serina slaps her friend, slaps Touma again, and slaps Serina even more. To make things even worse, she tells Serina that she has to prove that she's her own person by giving her her semen.