Hanamura-chan, Sex Friend ga Iru Kekkon tte Ari desu ka?

She is 28 years old, has a graduate degree, and has been with the company for 3 months. Kaori Hanamura, is a rule-follower. On her way home from work one day, she sees her married boss (male) and her senior (female), who is also married, coming out of a love hotel. I can't allow adultery in any way," she says! But, she is told that their relationship is an "official friendship between husband and wife."