JUQ-059 My favorite step sister is sleeping with her worst friend.

And Mizuki is not a real brother and sister, and we met a few years after our parents remarried, and our parents died unexpectedly, and I had an emotional relationship with Mizuki, and I just wanted to spend my whole life with Mizuki, and to be taken away by my good friend Kyohei, who was fond of our relationship with the beautiful girl, so I was in a hurry to close my space...