Hana Ogawa 28 years old. Toru's wife. A designer working at the design firm Prismir. She is Yuzo's subordinate. While she respects Yuzo as a highly capable professional, she tries to keep her distance because he is known for flirting with women. 160cm, C-cup. She has a very good figure but usually wears plain clothes to avoid drawing attention to it. She has a very high sense of ethics and is quite serious. She loves Toru and is deeply hurt by his affair. She dated two people before marrying Toru. She always speaks in polite language.

Anna Mamiya 24 years old. 165cm, D-cup. A designer at the design firm Affiche. A temporary employee. She has had a relationship with Yuzo since her student days, predating her involvement with Toru. She approached Toru on Yuzo's orders. She reports to Yuzo regularly. She has a very free-spirited personality and takes an aggressive, sadistic approach with Toru. She is obedient to Yuzo.

Toru Ogawa 30 years old. 170cm. Hana's husband. He is visiting Chinraku Onsen for a three-day, two-night trip with Anna. He has booked a private villa. A sales representative at the design firm Affiche. His sales performance isn't great, but he's grown overconfident because Anna constantly flatters him. He started dating Anna three months ago after she seduced him. He is looking forward to this trip immensely.