A fateful Summer day. Seventh grade Hajime Yasaka is making a strawberry bomb for his school's free research project. This strawberry bomb, which looks exactly like a real strawberry, is in fact an incredible invention filled with candy and a ton of peppers, wasabi and mustard powder. Hajime plants this strawberry bomb on a strawberry shortcake and attempts to make Yamashiro - who in Hajime's eyes is a despicable person - eat it. However, while Hajime's back was turned, the booby-trapped strawberry shortcake was taken by someone...