Clannad: After Story - Mou Hitotsu no Sekai, Kyou-hen

Synopsis

A young man finds himself in a budding romance with a girl who bravely confesses her feelings on a wet afternoon. Their relationship blossoms quickly, but a school rumor involving his girlfriend's sister threatens to disrupt their happiness. As misunderstandings and emotions escalate, the couple and the twin sisters must confront difficult truths to discover the real nature of their affections, even if it leads to heartbreak.