tl;dr: A solid story centered around a group of interesting friends that ends too quickly. This manga was incredibly solid for what it was, but it was too short. The core concept of there being someone that's very good at dealing with criminals at the center of a group of friends of inherent criminals is a really interesting character set up. The criminals also had a pretty interesting set of skills , personalities, and quirks to them, which ultimately made them an incredibly great group of friends to just watch as they lived their school lives. Plot wise, for the majority of the manga, there isn't much to the plot beyond this, butbecause of the strength of the cast it is amusing and enjoyable to the end. There is some level of plot though, and what it has is pretty good. Mainly, arc revolving around Harukana, her problems, and how the rest of the class helps her overcome them to become part of the group was incredibly well executed and the development, especially the scene as it closed off was great. The larger overarching plot also seemed to begin developing, relating to special bloodlines, Tamito's special ability, and what the purpose of the school ultimately was. While all of this ends on a pretty solid note, so it is somewhat satisfying, it still feels like it ended way too early. Relationships are still completely up in the air, though there may have been a hint at what direction they were going in with the extra. Characters still have a lot of room to be further explored, such as in that they all got character profiles and families that we saw very little of. And the plot only just got set up, with a lot of potential that just got nipped in the bud. It felt a lot like a single cour anime adaptations of a longer manga, but without anything to fall back on to read the rest of the story. I've heard that the author got sick, which lead to it being dropped, which I understand and hope they've returned to good health, but it is quite a shame. The art was also really good.