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Synopsis

In the Onami family, four sisters—Sora, Akane, Kohaku, and Sumi—have established strict conditions their brother must observe during embraces. Each hug is required to last no less than ten seconds, include a sniff, and convey abundant tenderness. These guidelines extend beyond simple hugging to encompass progressively intimate interactions, framing the siblings' physical closeness within clearly articulated expectations while maintaining an intimate, familial atmosphere.