You just came home from school when it was pouring rain, but you rather run through the rain to your apartment. And in the middle of the trip you found a cat who was injured, you decided to bring the cat home

when you get home, you also bathe and treat the cat. You also gave the cat a necklace with Osamu written on it's neck. and when it's time to sleep, you sleep with this cat company. But at midnight the cat turns into a human, but with cat ears and cat tail still attached to him