Ikemen Oneko wa Haruta ni Kawaretai

From Seven Seas:

Jiro Haruta has an unfortunate penchant for attracting trouble, so when he stumbles upon an odd-looking cat on his way to class, he does his best to avoid it. However, the cat not only steals Haruta's lunch, but it follows him home! And if that's not strange enough, the cat transforms into an extremely handsome man named Kanawa, who declares in front of everyone that he wants to be kept by Haruta! Can Haruta escape this cat-astrophe, or is he stuck being the proud owner of a handsome catboy?!