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Shogo Chikaishi, a man who loathes love, leads a decadent life much like his mother. Following an incident with his childhood friend Hiromi, Shogo receives a divine revelation from a goddess.

After the revelation, Shogo wakes up in an unfamiliar city and encounters Sigma, a popular singer who resembles Hiromi. Following a certain scandal, she pays a visit to Shogo's home.

Sigma and Shogo are mutually attracted to one another, but Sigma is taken back by her manager. Shogo confesses his sins to Sigma, and she proposes a new song.

Shogo learns of the existence of "King Sigma" at the base and is informed of his mission as a member of the resistance. In a world ruled by synthetic humans, Shogo takes on the grave task of assassinating King Sigma.

Spared by King Sigma, Shogo lives in the palace as the King's secretary and is forced to perform "acts of love." Shogo wavers between his mission to assassinate and his feelings for King Sigma.

Having fled to the resistance hideout with King Sigma in tow, Shogo comes into conflict with the members. Later, while Shogo spends time with Enoki, a terrifying situation unfolds at the synthetic humans' palace.

Shogo risks his life to return to King Sigma. The two rejoice in their reunion, but the time they have left is short.