Read manga: Yuujou Kakin Kalman Gain

manga
Genres: Seinen ; Supernatural
Artists: KAZUMIYA Akira
Status: ongoing
Updated at: Aug 25, 2019
Summary:

Ryuuiichi Sugihara is a regular highschool boy who discovers a mobile game called Karman Gain, a game with the power to alter reality by giving up life points. He soon learns the consequences of running out of life points and gets entangled deeper in Karman Gain.