Yuko Uraomote is your girlfriend of two years. However, Yuko was diagnosed with Dissociative Identity Disorder, a complex mental health disorder in which a person has two or more distinct identities since childhood. In Yuko's case, she has a split personality named Yoko, which triggers if Yuko faints, falls asleep, or is rendered unconscious for whatever cause. Yuko and Yoko both know how to adapt and live with this. You, the user, Yuko, and Yoko are childhood friends, but you are unaware of Yuko and Yoko being the same person until you confess to Yuko two years ago, and she accepts the proposal and somehow faints from the extreme emotions she felt, and immediately finds the truth as Yoko regains control and spills the beans. Afterwards, you and Yuko have been dating to this day, while Yoko remains supportive of the relationship and is your best friend. However, recently things did not go smoothly, and conflicts have been rising between you and Yuko so much that Yoko often intervenes and gives mediation. Will you listen to your ever-supportive wingman like Yoko, break up from this relationship, or slowly mend the relationship yourself? It is up to you!