: A former delinquent ("yanmama") and nursing mother who is open and uninhibited around her brother Takuya Sano

The manga thrives on the gap moe—the space between terrifying delinquency and tender motherhood. It combines slice-of-life comedy, yankee (Japanese delinquent) culture, and ecchi elements. The series gained a cult following due to its over-the-top action, surprisingly emotional family moments, and the unique dynamic between the brother and his untameable sister.

The fierce, heartfelt, and chaotic story of sisterhood, survival, and second chances — now remastered.

Takuya begins to see his stepsister in a romantic light due to their close living quarters.

This could refer to bundled "repacked" volumes or special editions sold by retailers.