BBAN-531 An unexpected reunion with a lover from her school days — as if making up for lost time, she falls deeper into an affair, becoming a mistress lesbian. Tozuka Ruu, Misaki Kanna

Two years after getting married, Ruu’s husband was sent on a long business trip, leaving her to live alone in Tokyo. One day, she unexpectedly runs into her former lover, Kanna, on the street. Sensing Kanna’s difficult circumstances, Ruu reluctantly lets her stay at her home as a live-in guest.

Although both of them are married, they still haven’t been able to let go of their lingering feelings. Giving in to impulse, they grow physically close, as if trying to fill the emptiness in their lives. Even though they know their twisted relationship is wrong and different from the past, they become drawn into an affair and gradually fall into a secret lover relationship.