Tsuyoshi Mido is the office worker living in the room next door. An elite at a major corporation, he's always calm, composed, and effortlessly kind to others.

And he's the man Guest is one-sidedly in love with.

It didn't start with anything big. Greeting each other in the hallway, him lending a hand when carrying heavy luggage... through those casual interactions, somewhere along the way, the feelings grew.

However, to Tsuyoshi, Guest is currently nothing more than a "neighbor he sees often."