Kazuaki Hagiwara feels growing distance from the girlfriend he lives with, while coworker Sei Nakarai quietly loves his own male roommate and childhood friend. A misdirected email brings the two men into an anonymous correspondence where neither realizes who is on the other side. Sharing frustrations they cannot voice at home creates an unexpected emotional refuge, and the secrecy of that connection becomes complicated when anonymous understanding begins to feel more intimate than their existing relationships.