Satoru, a marketing executive, has earned the unfortunate title of the Worlds Worst Lover. His complete lack of skill in the bedroom has led to a long string of failed relationships and a shattered confidence. Just as he hits rock bottom, he is suddenly visited by a supernatural being: the God of Seduction, a small, quirky deity affectionately nicknamed Ecchan.

Ecchan reveals that Satoru is not inherently bad at love; he has simply never been with his destined partner. The god explains that the only way to achieve true sexual and romantic fulfillment is to find Satoru's perfect match, a soulmate with whom his body and spirit are in total sync. That destined partner is identified as Shinya Hoshina, a wildly popular and famously kind actor.

Using Ecchan's guidance, Satoru manages to get close to Shinya. However, the situation is complicated by the fact that Shinya can sense Ecchan's presence and believes Satoru is possessed by a troublesome spirit. This misunderstanding leads to a surprisingly intimate night, as Shinya agrees to help Satoru exorcise the supposed ghost through physical contact. This encounter redefines everything Satoru thought he knew about pleasure, revealing a profound physical compatibility that shatters his previous self-perception as a straight man. What begins as a farcical divine intervention soon deepens as Shinya's genuine kindness and sincerity begin to melt Satoru's heart.

The narrative follows the classic romantic comedy structure, moving from a bizarre premise to the development of sincere feelings amid comic misunderstandings and half-truths. The central conflict arises not just from Satoru's insecurity about his past, but also from the lies upon which their initial relationship was built. When the truth about Ecchan and the soulmate scheme comes out, their bond is threatened. A notable arc introduces a rival in the form of Shinya's female co-star, who attempts to insert herself into their dynamic, pushing Satoru toward a Domme/sub situation that he does not want. This external pressure forces both men to confront their true feelings, leading to a reconciliation where they finally form a stable, honest relationship. The story ultimately uses its outrageous premise to explore themes of genuine compatibility, the importance of honest communication, and the idea that great sex is rooted in authentic human connection.