If you are allergic to adorableness - this game will kill you.
Beeing cute is only selling point of this game so cute-factor is overwhelming here.

Beside that - it's barebone arena hack 'n' slash.
If you play with the same characters from the beginning - you will finish it in 5-7 hours. If you like to change characters you will encounter some fights that are too hard for you... because all levels are level based - if you want to play with a lot of characters (and you have to do it to unlock hidden scenes) you will spend some time on replaying the same levels.
You can choose from various clothes... but you have to find them first (5 parts each set) and it's random.
There is a lot of hidden stuff there - but it all requires high ammount of grinding to unlock.

Also don't even think about playing this without a controller.