At the end of the second season, in Saga City, which is about to be held at the Saga EXPO, aliens invaded the earth. In Saga, the survival of the world depends on the protagonists.
Teenage Tutor Fuutaro Uesugi has to finally choose between the 5 Nakano Sisters, who all have feelings for him, at the School's Upcoming Cultural Festival; the event that will lead to his Wedding to one of them in a Flash-Forward.
