The room of Tsukasa, a college student with no romantic experience, has become the hangout spot of his sister and her delinquent friends. One day he finds a bulge in his bed and after he pulls off the blanket, the most beautiful of his sister's friends, Erika, is sleeping there. "Oh sorry... I'm very sleepy because of my period." "You're too naked to respond correctly..." Not being able to leave a naive and uninhibited girl alone, Tsukasa teaches her some manners aShow more