■Miyu Saito, an unprotected milky sister who is harassed by her super-desecrated brother

One day, only female college students are informed by their mother that they have a younger brother who is different from each other. Miyu's divorced father married another woman, but she disappeared after giving birth. And the other day his father passed away, and he wanted to raise him with no relatives. Then my brother Yuya comes to the house, but perhaps because he has grown up in a man's territory so far, he does not adapt to the new environment, and see how it looks, Miyu tries to gently touch his chest to try to be careful.