Adventure and trouble diary manga

Adventure and Trouble Diary summary:

"If you become my wife, I'll grant any wish.." Maybe it wouldn't sound half as crazy if Saeju wasn't told this by a cat (who may or may not be some kind of prince.) But she's desperate for some payback, particularly when her longtime crush blows her off, ice-cold style. But what happens when you invite someone downright..unearthly..into your life? Saeju's about to find out- particularly when one strange cat becomes one strange "brother" she didn't ask for!