• Book Name: YUUJOU KAKIN KALMAN GAIN Manga
• Alternative(s): 友情課金カルマンゲイン
• Genre(s): Seinen Supernatural
• Author(s): Kazumiya Akira
• Year 2013
• Status: Ongoing Download Manga
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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.