Seriously.
I don't think I've ever read such a frustratingly convoluted pass-the-Idiot-Ball-around manga in my life. As another reviewer pointed out, the world is apparently run by high school students. Yes, it's an adult-free dystopia in the world of Arisa! There are no teachers, the police are useless, confidentiality means nothing, and it seems like everyone's hopped up on some hip new designer drug half the time the way they get on. All the adults in this manga suck, and so it's up to a couple of delinquent kids to set everything straight so that they can stop the string of disappearances, accidents, and even murders that are all connected to their school and that have been mysteriously overlooked by anyone of consequence. Yeah, it's that kind of manga.
Still, it kept me reading the whole way through. I'm not sure I can exactly explain how, but I can certainly point to a few factors that helped. The art is clean and sparkly, reminiscent of Arina Tanemura's trademark style that I've always been a sucker for. Unlike Tanemura's works, however, Andou's manga is much darker in tone and content in spite of the fluffy, eye-candy artwork. Yeah, you read that right. This manga is downright dark, especially for a shoujo title (and especially especially for something out of Nakayoshi). In fact, the aspect of the story that really did keep me hooked was the building mystery. Sure, there were way too many "Kings" to really be plausible, but the escalation of 2-B's crimes and the urgency of Tsubasa and Manabe to find the culprit really added that dark layer of suspense and intrigue that this kind of story needs. Speaking of Tsubasa and Manabe, I found them both to be particularly gripping characters, even though the latter seemed to drop off the radar for a good portion of the final volumes. One of my pet peeves in any work of fiction is when a character is introduced as tough but is shown to be exactly the opposite. Tsubasa really does earn the right to be called tough throughout the manga. She is both incredibly feminine (her looks, her aspirations, her emotions) and yet at the same time, she takes a very active role within the story and doesn't play second in command to the male lead (thank God). Overall, I found her to be a well-rounded character who never got overtly distracted by romance (as shoujo heroines tend to do) or gradually reduced to cheerleader. She starts as the protagonist and ends as the protagonist. Though she has her fair share of Idiot Ball moments, she takes it up no more often than any of the rest of the cast. And, hey, I liked her so much that I was even hoping for a little extra romance between Tsubasa and Manabe. You know, because they actually had some chemistry and weren't mooning over their love lives the entire time (or any of the time, really). But at least they didn't become a romantic plot tumor. As for the titular Arisa, I'm more divided. I feel like if I wanted to go back and trace her motivation throughout the series, it wouldn't make a whole lot of sense in regards to where she ends up. Oh well.
So anyway, don't take this one too seriously because if you do, you'll find yourself smashing your head repeatedly against the keyboard by the multitude of inane and unrealistic developments the story takes. But if you're bored one day or are just looking for a good, darker shoujo mystery that's not as tight as it could be, I recommend you give this one a shot. While it's certainly not the best manga out there, it's far from the worst.
I'll give it a 7 out of 10. It entertained me, and I definitely feel like I got something good out of reading it.