Koga Nao wakes up the morning after a college drinking party feeling inexplicably good — until the girl next to him, Toiro Kirame, begins filling in what happened and arrives at the wrong conclusion. She demands he take responsibility and start dating her. That same day, his longtime crush Nobuta Yua — who has dodged his confessions for years — suddenly declares that he is now her boyfriend. Koga now finds himself somehow in two relationships at once, trying to keep both from discovering the other, while his friendships around him shift and complicate in every direction. A chaotic, drama-filled romantic comedy with no clean exits.