This isn't a good, neither a bad's one.
Kamenashi Kazuya plays a cop who falls in love "without a reason" with a high school girl.  Kame's character is good, not particularly likeable but good.  
What I didn't get while watching this movie is why, for God's sake, an adult man like him fell in love with a high school student who acted exactly how one of her peers.
The ending with Bruno Mar's song was the part the I actually liked better.
Not a good movie, but definitely better than other shojo manga filmed this year.
*cough* peach girl, for instance.*cough*