The Shion sister next door has always been cold and scary, so I've never really liked her... But our parents are close, and when mine go on a one-week trip, she ends up taking care of me! Despite her rough attitude, she spoils and sexually harasses me in various ways! She watches AVs with me, even calls me to the SM club where she works... And then it hits me. Does my sister actually like me? A completely subjective experience of cohabiting with a tsundere big-breasted sister!
