Sakurazuka Tsukumo

Another Tsukumo that Tsukumo finds alongside another Natsuki. In this temporality, Tsukumo ("Onii-san") managed to save Natsuki from her accident, however he finds himself in "double copy" in his temporality (present time). He then decides not to interact with them so as not to destroy the temporal flow (or something like that) but a fight between his other him, Natsuki (who loses consciousness) and thugs force him to intervene.

Being the same Tsukumo that the player controls since the beginning of the game, he keeps all the attributes of his counterpart, just his role changes.
Seen only in the third chapter.