Katsuragi Keima is a hardcore gamer, also known as the 'God of Conquests' since there is no girl in a game he hasn't been able to win over. People often seek his advice about gaming. He has no siblings, only a mother and a father.
One day he gets a note from New Hell that he takes as a challenge to his ability to conquer any girl there is. To Keima's biggest grief it turns out that the challenge he accepted has nothing to do with girls in games. Moreover, he's going to have to conquer the hearts of 3D girls --or real girls. If he fails this task, he'll loose in the game of life. He has now a contract with a demon, and both of them risk getting their head cut off if he refuses to conquer the girls or if he is unable to do so.
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