When I was young, my mother left home for another man, and my father cried every night, which made me very sad.

Even so, I still behaved normally at school so that no one would find out about my family issues.

A few years later, my father remarried, and I got a new family, a gentle and kind mother, and a sister who was a bit into gaming.

I truly felt extremely happy a few years later when I left my hometown to study at a university in Tokyo.

Since it was the first time I had to live on my own, my father was very worried, but he was also very proud of me. My mother felt the same way, and that was what made me happiest; however, just a few years later, my father passed away.

Today is my father's birthday, so I returned to my hometown. This place hasn't changed at all. Seeing my mother still healthy, I feel incredibly happy. My sister-in-law has not changed at all; her room is messy, she is around 30 and still alone, dressing sloppily, addicted to gaming, not wearing a bra, and wearing socks like an old man... Actually, there was once a feeling of wrongness that appeared in my mind.

To cut off those feelings, I chose to go to Tokyo, but when I returned and met my sister again, those feelings surged back. When I unexpectedly saw her masturbating in the room, I couldn't bear it anymore! After that incident, I also discovered that she seemed to have feelings for me, feelings that are incredibly wrong. A few days later, I returned to Tokyo, promising to come back next year to meet her again, and maybe the child she has already named after us...