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Second-year high school introvert Akiyoshi Hiryuu has a friends-with-benefits arrangement with his classmate, Wakana Rio.

Rio is an elegant, black-haired beauty born into a wealthy landowning family. Thanks to her overly strict parents, she's never really been allowed to enjoy normal teenage pastimes.

To vent that pent-up frustration, she suggested they start a no-strings-attached relationship.

Except...

She wants to eat lunch together.
Walk home together.
Spend weekends together.

She's doing everything except keeping it no-strings-attached.