On my way to school, I saw a cat lying on a bench in the park. When I came back from school, I intended to stop by to see the cat again, but it was nowhere to be found. Instead, there was a beautiful girl with a bruise on her face. That evening, when I went to buy some alcohol at the grocery store, I saw the girl from earlier still sitting in the park. I approached her to invite her for a drink, and she gladly accepted and suggested we go to my place to drink. I had no idea who she was or what she did, but for some reason, I just couldn't stop being concerned about her. That night, Sister Miu proactively invited me over, saying it was to pay for the 'overnight fee.' A few days later, we were always together until one day I came back and didn't see her. It turned out she lived in an apartment with a man upstairs. That man often abused her to the point where she couldn't stand it anymore and had to leave. She didn't want to bring trouble to me, so she decided to return to her hometown in Fukuoka...