Naruse Seito

One who continues to show up only at school on Sundays. He is the one and only being in the world of rain who is not "affected" by rain and who "should not" be affected by it.

The cold-hearted person is Masato's only remaining family member and the only reason for his life. His best ally. Yet why does a chill run down Masato's spine when he is in his brother's company?..

Being only an illusion and a different personality that was "created" by Masato due to being too lonely, he does not exist in reality. He supports his brother as much as he can. Also, he recognized "the child story," which he drew with his brother, as some sort of rule—"the wolf, who has eaten the impure rabbit's flesh, should die." Therefore, he, controlling his brother's body, commits many murders: dogs, girls who look like his mother, his mother herself, Niimi Nobuo.

He is the so-feared Jack the Ripper.