Ashita Sekai ga Owaru toshitemo

Shin has withdrawn into himself since his mother’s sudden death, with childhood friend Kotori remaining his closest companion. When his father dies just as unexpectedly, a look-alike named Jin arrives from another version of Japan.

Jin reveals that people’s lives are linked to their counterparts across the two worlds. He intends to overthrow a tyrannical ruler by killing her counterpart, Kotori, leaving Shin caught between protecting her and a conflict reaching far beyond his own reality.