It is not related to Ichijo's key (1-2 volumes)

the publisher:
Author: Yu Misaki
Size: 112mm x 174mm
Number of books: 2
Language: Japanese
Category: Girl manga, manga
Latest release date: 2017-04-20

Synopsis:
"I don't care with you because I like you ..." Ritsu Kanzaki, a third -year high school student, died of a classmate and a lover's key in an accident.
The only way to save the key life is to create a "another future" that Ritsu does not become his lover ...!?!?
Ritsu will return to the past and start a second high school life with the help of the god of space -time.

[Benefits] Volume 1 paper