"Sakura season... Whenever this time of the year comes I remember..."

Izumi, a student, confesses his feelings to Kuma, a physical education teacher, but declines him because he is in a relationship with a girl. However, Kuma's girlfriend keeps pushing him away and wouldn’t even give him a blowjob. He considers going to a brothel but shots it down because it’s a bad idea. How can he relief all of his sexual frustration? Kuma's next idea is to call Izumi and ask him "Have you ever given someone a blowjob?"