A-Meow-Rous Love (Amour)

An author with no target or dream to live. He only thinks of his job and how he will live in the future. Suddenly, one fateful day, he becomes "the chosen one" (which he's not happy about it)

He has to take care of a half-cat-half-human girl, until she's 18. And also, he has to get rid of her childishness and help her "grow up"

What will happen between this unfortunate couple? And most importantly, how will this girl help him get away of his "pointless life"?