Hakomari 2 can be read here.
A few months have passed since Hakomari Part 1, and Kazuki's life is approaching normal again. Except that Maria is still around. She knows that the mysterious 0 still has an interest in Kazuki, so she's not going to leave his side until they have a chance to defeat this enemy once and for all. Of course, sticking close to him creates all kinds of rumors that Kazuki would rather avoid, but what choice does he have?
His life suddenly deviates from normal again when both Maria and Kokone receive texts from him professing love. Maria quickly deduces that this is the work of 0 -- he's given someone a new Box and they're using it to take over Kazuki's body. Too bad Kokone didn't get the memo. This new User soon manages to alienate all of Kazuki's friends, and though Maria remains on his side, even she can't trust him when she doesn't know if she's speaking to the real Kazuki or the User.
This volume isn't nearly as claustrophobic as the first, which felt as though it was taking place entirely within a small room, even when characters were outside -- which makes perfect sense given the nature of the Rejecting Classroom. This time the world is more expansive as the characters aren't so constrained in their options. But that doesn't mean the story is any less creepy. But instead of Kazuki being trapped by the Box, this time the uncanny sensation comes from his body being possessed by an unknown force and used to destroy his life. There's one point when the User does ... something to Kazuki's sister and then sends a voicemail of her crying in an attempt to get Kazuki to cooperate.
My only complaint with this installment is that it falls prey to the Law of Conservation of Characters, which is odd in that it normally only applies to movies and TV shows where additional characters cost money. Here Mikage doesn't create enough new characters, so the number of suspects is limited; whereas the User in the first book was a surprise, I figured this one out before I even got a quarter of the way into the story. I'll admit that Maria's investigation was nothing short of brilliant -- the way she manipulates the User-possessed Kazuki is amazing -- but the way the story's structured made it redundant: the culprit can only be [SPOILER] or Sir Not Appearing In This Story; and, surprise, it turns out to be [SPOILER]. There's enough good stuff in this book to counterbalance this complaint, but the story would've worked better with a few more suspects.