Hane Aoba is a dedicated executive who strives to help her colleague Aki Kaminaga get closer to Atsuto Sugaya, the girl he has loved for a long time. However, Hane also faces her own personal dilemmas, as she is about to marry her boyfriend. One night, while chatting with Aki in a bar, Hane gets drunk in an attempt to forget his worries, but this turns out to be a grave mistake, as he ends up having sex with Aki.