Takumi is a reticent man who struggles to fit in at work and is constantly pressured by his parents, but he at least has a beautiful fiancée, so he insists that he’s happy as can be. That all changes one day when he runs into an old college friend named Monika and blacks out while catching up over drinks. Upon waking, he finds out she recorded the whole thing, and he now has to bend to her devilish whims to prevent her from upending his life. What does the enigmatic and capricious girl have in store for him?