Sweet Home: H na Onee-san wa Suki Desu ka?

Ryuichi is a university student. He used to live alone and enjoyed his school life. But one day, his apartment was destroyed by a fire.... He reluctantly comes back to his house. But his house has been changed to a boarding house for girls...! It seems there is no place for him to live. But they all allow him to stay there together! His new life...