Mizumori Sei

A second-year student.

She used to be childhood friends with sisters Tsubasa and Sawa and lived nearby. She
has now left home and lives alone.

Although she has a somewhat twisted personality, she got along well with Tsubasa and Sawa since they were young, and they often spent time together.

Her father is an executive at a famous company, and her family is quite wealthy.

She attends a correspondence school, and usually doesn't leave the house.

She doesn't get along well with her parents (especially her mother).
She was fed up with her mother, who was a so-called "educational mom," and started living alone early on.
(She only got her to agree to living alone on the condition that she enter the top school her mother wanted.)

Although she receives financial support, she doesn't touch the money.
She makes and streams videos, and earns enough to cover the costs of living alone.

She has a lot of illegal knowledge from information she has obtained from the internet.