This is a anime people will either hate or love. As a precaution, do not watch this thinking it will be ecchi with lots of panties, boobs, etc. Although you'll see some, they aren't the main thing.
Story 9 - I give the story a 9 since it may seem boring at first but later on it gets interesting and there is even a twist that I was not expecting. Not to mention it feels fresh and different. And it also has hilarious moments that had me laughing.
Art - 8 The art is great, its not stunning or anything special but good enough.
Sound - 7 Sound effects are alright and soundtrack mostly fits, not the best nor worst. I really liked the opening and ending themes though, they are a excellent match to the anime.
Character 10 - Character is the best part of this anime. The personalities are wonderful, its very easy to tell each character apart. This next part may be a minor spoiler: later on you will start guessing which character is which since they do certain things.
Enjoyment - 9 Truthfully I was bored by the beginning, thankfully I kept watching each episode even though it was taking a while. Towards the middle is when things became interesting and I really became interested.
Overall - 8 It could've been better in some ways, but good enough with what it has.