Mari Osano

As a mature housewife, Mari is confident and self-assured throughout most of Sisters' Sexual Circumstances, contrasting with her immature, bratty younger sister. She is described in UMEMARO's recruitment posting for her voice actress as a "big sister type, calm, and eccentric." She is also shown to be willing to experiment sexually, demonstrated by her willingness to engage in foreplay with her own sister, and when she engages in sounding with the younger brother in her true ending. She seems generally content with her marriage, but is sexually frustrated, as her husband frequently falls asleep when she tries to initiate sex, or is out for long periods of time on business trips. This frustration has caused her loyalty to Kôji to weaken substantially, as evidenced by how quickly she consents to having an affair with his younger brother, particularly when he pleasures her successfully. Mari's sexual depravity is even more pronounced in Mari's Sexual Circumstances, where she is willing to drug a repair man in order to have sex with him, and engages in direct, willful netorare at Kôji's expense, calling him while she pleasures another man repeatedly. The only time she is shown to be timid or uncertain is at the very beginning of Sisters' Sexual Circumstances, when she is unable to get Kôji to have sex with her, feeding into the frustration that allows the younger brother to swoop in. The movie and game versions of the game provide several different epilogues. In the movie version, Mari is seen engaging in more anal sex with the repair man while she is on the phone with Kôji. In another ending in the game version, Mari is caught cheating by her husband, as he realized what was going on during the video call, but agrees to stay with her on the condition that she does not cheat again, something Mari promptly fails to do. The third ending occurs if the player is unable to successfully have anal sex with Mari during the final sequence of the game - Mari calls the maintenance company, requesting that they send someone to fix the water pipe in her home.