Eroge Sekai ni Tensei Shita Ore ga, Oshi e no Ai de Netorare Heroine wo Shiawase ni suru.

Synopsis:

Mitsuki becomes enamored with Kotoha, the game's protagonist, after beginning to play an erotic game that a friend suggested. But this is an NTR game where Ryo, the player's best buddy, seduces the heroine? When Mitsuki is looking for a happy ending with Kotoha, he stumbles onto the train platform by accident. Upon awakening, he is confronted by none other than... Kotoha!? He was shocked to learn that Mitsuki had returned as the player of "that" game. Mitsuki is resolved to alter fate this time around because to his extensive knowledge and passion for games. He needs to have the ideal happy ending to keep Ryo away from Kotoha and the others!