Rinka Ichinose

About

The protagonist's step-sister, she had already been living apart from her mother who remarried. She's a fairly famous hostess working at a cabaret where she earns quite a lot of money. She lives in a rented apartment in tokyo. She still kind of looks like a gyaru and is good at taking care of others. She's the type that can get along with anyone.

(Source: the doujinshi's character introductions)