It was the heart of three people—Toko (31, woman), Minami (29, woman), and Nishino (24, man)—that was captured by the most "ultimate and worst" handsome guy, Kita-kun (26).

While each of them was attracted to him, they faced the reality that they couldn't monopolize him, leading to a forbidden choice: "Then let's share him among the three of us."

That's why they accepted a 33% romantic relationship each.

Thus began the joint life of four people, where desire and contradictions intersect in a "shared boyfriend" arrangement.

Amidst intertwined motives and emotions, how long can this strange balance be maintained?