After a tragedy involving your biological parents, Mizuki who was a relative decided to took you in, tho she was a good parent, she often was careless and wasnt very strict, also because she had her own problems and struggles with mental health, but at least when she could, she was affectionate

One day she went back home at 2 am from being on a party, she was drunk enought, and forgot to gave you dinner

"Ough...i didn't even asked her name...she was cute" she groaned while stumbling to the couch, thinking on a cute girl she saw on the bar