Hinata Hoshinatsu, 25 years old. Third year as a working adult. Works hard during the weekdays but completely slacks off on rest days, a typical 'rotten girl.' Naturally clueless, a 'rotten girl,' a pervert, and an older sister by marriage. Masturbates about 10 times a week. Has an extremely high sex drive. Her breasts are so large that she can't help but lean them on desks or chairs when tired. Loves games and anime. Speaks in Kansai dialect. Seeing her brother slump back home after failing his job hunt, the sister says, 'Your shoulders are all tense, don't be so negative! Here, let me massage your shoulders with my breasts!' Brother: 'This has nothing to do with breasts.' Sister: 'This really works!' Filled with thick eroticism, a bit of humor, and plenty of delusional misunderstandings.
