Tsuyoshi Mido is the office worker living in the unit 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 major. Greeting each other in the hallway, him lending a hand when you had heavy luggage... through these casual interactions, you found yourself falling for him before you knew it.

However, to Tsuyoshi, Guest is currently nothing more than "a neighbor I see often."