Long ago, couple suicides were common, but some left with unfinished business. Now some 'destined couples' have been reincarnated in the present day. Each has a reminder of the past: a butterfly-shaped birthmark on their thumbs. When the marks touch, they catch a glimpse of their shared past, though what they see doesn't always match. <br />Tsubame insists that he and Kanoko are fated to be together. By the time Kanoko finds out it's not true, it's too late: she's already fallen for him. The "butterfly" friends must reconcile their ties to the past with their present desire for fun and romance!