This story is about Saeki Ittetsu, who claims to be from a parallel world, staying at Usami Rito’s house for a few days.
It contains unsettling themes, bloodshed, and hints, or even direct depictions, of the death of A-Men from the parallel world. It
is heavily fictionalized.

From Noronoro comes a serious story centered around Saeki Ittetsu and Usami Rito!!
Suddenly appearing at Usami’s house is Saeki, who has come from a parallel world that has been destroyed.
His goal is to use the recoil from the transfer to travel back in time little by little and prevent the destruction of his original world!? A
serious and poignant superb story that you won’t be able to put down, so please enjoy this supreme book.