A really interesting volume where a lot of things escalate at once. Toya finally tries to escape back to Aya, and tries take Aki with him, to rescue him from the Mikages (albeit obstensibly because Aya wants it, and not necessarily for Aki's sake, but Aki definitely cares for Toya to a degree and Toya seems to sympathize with him). Aki also finally collapses under the power of the progenitor's personality, largely with the aid of the cursed corpse of Ceres. It's really just tragedy for Aki.
Meanwhile, everything that happens finally comes to a head for Aya, who has a moment where she understandably admits it's just all too much. She's going through FAR too much for anyone, let alone a 16-year-old with a dubious support system. The good news is, she does have people who support her. It's just still a scary environment.
The character development is what really shines in this volume, whether it's Aki and Toya's relationship, Toya's desperate fear of himself and what he's becoming, as well as his selflessness to try and protect Toya and Aya, Chidori and Aya's developing friendship, Yuhi's admission that his love is his own problem, and Yuhi and Toya's antagonistic but relatively supportive relationship. There's a lot of fun stuff in this volume, and it's arguably the best of them all.
The funniest author's note yet is also in this volume, which more than makes up for the error repeat page in the iOS ebook.