Imouto no Tomodachi no Bijin Yankee JK: Sekenshi Suru Sugite Sewa wo Yaiteitara Horeraremashita

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 ver