Fuyutsuki Yuuma

The protagonist of the story. His mother Yayoi died 10 years ago, his father Yudai fell into a severe depression, before disappearing, he left Mirei in charge of his upbringing and care. Over the years, Yuuma treated Mirei as his real mother and his childhood friends, Misa and Miu as his sisters. However, he did not know that the three beautiful ladies want to love him as a man and have a lot of sex with him.