Seiryuu Academy, the Second Flower Decoration Club– This club that gathers the top beauties in the school is a mysterious organization of unknown activities and admission conditions. The protagonist, Shimizu Shou, due to some strange opportunity, was recommended to enter the Second Flower Decoration Club by his sister Hijiri, a member of the club. “Bro-Brother. That stain…perhaps…?” “That’s not it, Hijiri! It’s just spilled orange juice!”…the conditions needed to join the club that are shrouded in mystery are…?