It all started with a cat.
The sweet, lovely creature that Shiroki lives with near the university. One day, it decides to wander into the apartment of Hayato Oogami—his rude, noisy neighbor who is up at all hours doing who knows what. When Shiroki chases after it, he discovers a scene beyond his wildest imagination…
— Description from Comic Vine community (comicvine.gamespot.com).
