Erika Kitagawa is married, but her husband is actually the father of her stepdaughter, Kuroki Ikumi, meaning the two are not biologically related. Erika works at a lesbian bar and has a habit of going on hot spring trips with her daughter every weekend. Her husband is currently stationed overseas and rarely gets to spend time with the family, so the moments Erika and Ikumi share together are limited. Each time, Ikumi looks forward to traveling with Erika. Though they form a family unit, their true bond continues to grow gradually.