Shabura Rental: Ecchi na Onee-san to no Eroero Rental Obenkyou THE ANIMATION

Based on the erotic game by Atelier Kaguya HonkyTonk Pumpkin. After the private lodge Suuichi planned to study at for his summer break burns down; from a meteorite strike, he takes up the offer from his sister(Nanami) to stay with her in the dorms over summer break. While in the bath with his sister