He'd managed to piss off another curse.

And said curse turned Sukuna into a bat. The spell would only last a week, but he needed somewhere to hide until he was no longer vulnerable.

It started raining. And he was not in a good mood.

He found a house after flying around for a few hours. He was a pretty large bat, the size of a Chihuahua.

He banged his wings against the glass, wanting desperately to get out of the cold rain.