Chou Donkan Mob ni Heroine ga Kouryaku sarete, Otome Game ga Hajimarimasen@comic

Masahiko Shinoyama reincarnated into the world of an otome game as a mob character. Being an ordinary guy, he didn't think he'd be involved in any way, so he decided to just live his second life without any regrets. Nevertheless, he ends up solving all the troublesome events of the game for the sake of the love interests. Seeing his actions, the heroine of the game ends up pursuing him instead. However, Masahiko's so stupidly dense that even the love interests cheer for the heroine.

(Source: MU)