Ore no Genjitsu wa Renai Game?? Ka to Omottara Inochigake no Game datta

"Conquer" all the ladies! A sexy and exciting suspense-thriller series! A young man awakes to find that his life has become a video game, and one that he must either win or die. Given the cryptic goal of "conquering" all the female targets, and no guidance of how to do so, he'll have to rely on the game's systems to untangle the web of violence and intrigue he's found himself trapped in.

(Source: MANGA UP!)