Michi is understandably still confused that her best friend made out with her one day, then pretended like it didn't happen, then introduced her to her girlfriend, then took her out on a date. Glad that's all cleared up now, now that she has a yandere gremlin literally on her back.
The ending is disturbing and hard to make sense of. Aizawa tries to possess Kasumi, comes to her senses, is forcibly sucked in anyway, decides to take advantage of it and touch Michi again, but is rejected? It didn't seem like she intentionally left Kasumi. So then 2 major questions: why did it force her to possess Kasumi, and did Kasumi build up a resistance after being possessed once? I figure at some point Aizawa has to start possessing other people, and maybe that's an excuse once they start sorting this out.
Speaking of someone who will inevitably someday get possessed by Aizawa, I hope the introduction of Reona's special friend is setting up her subplot. She's been benched for a while and I always have fun with her lines. Next chapters are going to have a lot going on between that, the play, Kasumi and Sayaka's exhibit, De:Lphinus crashing the festival, and the fallout of Michi realizing she's gay haunted.
A lot of re-iterated ideas this chapter (probably since the previous 2 chapters have felt more like twists or diversions on the plot so this is the proper start of volume 3). Special attention given to 2 major concepts: Michi feeling detached from the world and Michi struggling to grasp love. The latter's hopefully the foundation for how things will soon go with Aizawa, and Michi will likely soon get the real answer to what protecting Aizawa means, along with figuring her role out.
Some other minor details that were probably thrown in for a reason: Michi's dad being a big collector of books? Still no mention of Michi's mom, but I'm long convinced she's either dead or some runaway medium herself. Michi being terrified of soccer clubs could be some kind of trauma. Maybe to do with the eyeless ghost in ch3, but that doesn't feel like a strong enough association. It's such an extreme reaction there should be something there. Also I guess Aizawa's afraid of ghosts.
The coughing is something to keep note of too. Last chapter Ange was coughing and seemingly haunted. This chapter, Kasumi coughs and rejects(?) Aizawa? Maybe there's a connection there, maybe not.
In the baseless speculation/fanfiction corner, I'm not even sure if I want this, but there's a slim chance Reona's friend is Non (whether she's aware). They're the same age and could have met anonymously online as big fans of Aizawa. Just a possibility. Also they'd be cute together and who am I to not ship girls who've never met? Give Reona an idol gf, maybe it'll calm her down.