It's a good anime for an audience who like anime depicting characters with tragic backgrounds and an explanation of the characters.
So, let's break it all down.
Story 8/10:
Kazami Yuuji is a boy who wants to start fresh and leave his assassin life behind. For that, he enrolls in a school populated by 5 girls each having their own troublesome past. The series is divided into 5 segments, with each segment dealing with one female character. The story about their past is well explained and then shows how Yuuji saves the girls and gives them a chance to start a new life. The stories are both sad and dramatic, giving this anime it's serious atmosphere.
Art 9/10:
The animation, graphics is quite pleasing. All characters are well designed and the protagonist is pretty badass looking, given his character.
Character 8/10:
Each character is well defined and their past is explained. Despite a few side characters, you'll probably get to know every main character.
Enjoyment 8/10:
It starts off as a typical ecchi romance harem anime. But once Yuuji interacts with the girls, the past is revealed and in a dramatic turn of events, he saves them. It's quite enjoyable and it's easy to make a few characters your favorite. It's not a bad anime, but it's still much suited to a mature audience.
Overall, it's a good anime from a psychological point of view and succeeds in proving that. Romance, well, there isn't that much of it.
