The first day of her long-awaited high school life ♪ Ruki was so excited that she ended up being late. As she rushed to the entrance ceremony, she heard a voice coming from inside the gym storage room! There, she found a ferocious beast, or rather, a handsome man being held captive!! The person in the storage room was second-year Toraji-senpai. He even told her, "Ruki is my zookeeper!" But Ruki is constantly at the mercy of this elusive senpai who is sometimes mean and sometimes kind...!? Can she tame this free-spirited handsome man?! A thrilling love story ♪