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University idol Takeuchi Mei is the "strongest heroine on campus": blessed with perfect looks and grades. But her secret other self is... a girl who works at the men's esthetic salon next door. Only one male student in the entire university knows her secret.

Only Kawasaki, a friendless guy, knows Mei's secret, and she starts hanging out in his room as if it were the most natural thing in the world. At university, they're strangers; at home, they're more than friends but less than lovers, living in a sort of half-cohabitation.

"If you can keep this secret for 4 years... I'll give you something special."

Thus begins, from a dangerously tempting promise, a strange and sweet cohabitation relationship.
Eventually, even other "men's esthetic salon girls with secrets" besides Mei start gathering in Kawasaki's room...!?
A once-ordinary university life is unknowingly transformed into the center of the waiting room.

Source: Manga One, translated