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Sekusu Yoshihito, known as "Yuni"—a lovesick boy often told he looks more feminine than girls—one day picks up a mysterious book from a junkyard. When he recites a spell written in the book, a beautiful demon girl springs forth from within. The demon proposes a contract to Yuni to grant a wish, and Yuni wishes to become irresistibly popular with girls. However, this wish comes with a huge "price," and the next morning, Yuni wakes up to find himself transformed into a beautiful girl!

Bring happiness to the girls who fall for you!

Here begins a yuri harem, where a former boy and a demon face challenges together!