Hentai-san to warawanai neko

It means that "A Pervert and the stony cat" shortly written as Henneko in Japanese. It's a story involving a school boy who wants to fantasize women and girls openly and a girl who thinks that she expresses too much of her emotions to other people. They both strike a bargain with a stony cat who is known to give them what they need by taking what they are willing to give up about them. This TV series is all about trying to gain back what they have renounced to the cat.