Synopsis

This work tells an adult “swamp love” story about a man and woman who once had a physical relationship while both were dating other people, reuniting after 10 years apart. Oonuma Mihono, who works at a travel agency, has broken up with her boyfriend whom she had even considered marrying, and before she knew it, had turned 30. Into her company transfers Ureshino Eisei, the man with whom she had a physical relationship 10 years ago, despite both of them having significant others at the time.
While flustered by Eisei, who approaches her with a cool, casual demeanor, Mihono resolves to interact with him normally. However, when the two are alone together, Eisei whispers to her in the same sweet voice as back then, unchanged after all these years. Is she his true love, or just someone to play around with? Unable to grasp his true feelings, Mihono finds herself drowning in their secret relationship.