Looks like Masaki is chronically cursed by Aizawa instead of catching a 1-time-deal. Aizawa's reaction to that, to Ange getting sick, and to claims of a curse once again signal she knows a lot more than she's capable of saying. Unfortunately she's not getting much chance to do anything either if this volume centers on the concert — Aizawa's still schoolbound in gay baby ghost jail.
At the risk of conspiracy theory brain: if Masaki has the Sight (cf. her ghost pupils) and is aware of Aizawa, is it possible that she's faking the effects of the curse in ch24? (Presumably for some reason connected to her instant and overpowering interest in Michi – maybe an interest in breaking up her relationship with her ghost gf.) The first time was legit, of course – Aizawa's silhouette transformation suggests some serious poltergeist/grudge energy was at work – but in the second instance, Aizawa was just guilty, curious, worried, etc. and still managed to hurt Masaki. (Whose current situation and characterization are still kind of a black box!)
