Tatsuo is a skilled masturbator who suddenly dies from masturbating too much. After dying, his soul was transferred to an isekai. An isekai goddess grant him a wish, then Tatsuo told him that he wanted a super cock that could make all women sigh with pleasure and make all women unable to live without it. He wants to make a harem with women who are already addicted to his super cock. (Source: Nekopoi, translated)