Amona, a dark summoner and demi-human who wields demonic powers, joins the adventuring party of Roni, an uptight and righteous priest. Given their opposing natures, everyone expects the two to clash and keep their distance from one another. However, on the very first day they begin traveling together, Amona and Roni unexpectedly share a passionate one-night stand.

The story follows this unlikely pair as they navigate their newfound physical relationship while continuing to operate as members of a small fantasy adventuring party. Despite the expectations placed on a priest who should abstain from earthly desires and a dark summoner feared for her demonic heritage, Roni and Amona find themselves repeatedly drawn to each other. Their secret encounters become a running source of comedy, especially as they attempt to conceal their activities from their fellow party members.

The supporting cast includes Eury, a sharp-witted elven archer who quickly catches on to what Roni and Amona are doing, and Haru, a naive and pure-hearted warrior who remains oblivious to the situation. Amona also commands an imp familiar, a summoned creature that often provides commentary on her relationship with Roni, sometimes breaking the fourth wall and vocalizing what readers might be thinking.

The setting is a classic fantasy world inspired by JRPG conventions, where the group takes on quests and faces various monsters. However, the narrative focuses less on grand adventures and more on the interpersonal dynamics within the party. The manga is structured as a series of short, episodic comedic events rather than a single overarching plot. These events frequently revolve around the central couple finding time alone together, their awkward attempts at secrecy, and the gradual, begrudging development of genuine romantic feelings beneath the surface of their purely physical arrangement.