Biggest question for me right now is why would Aiko kill herself... and what exactly did Claire have to do with it.
Also Elena's character is pretty nonsensical to me at the moment. When she first met Shuuichi after erasing his memories she acted like some sort of dumb, info-dumping yandere that was willing to let Shuuichi kill her (she almost killed him instead, out of jealousy and also left him by the side of the path like it wasn't her problem when she's supposed to be the girl that absolutely adores him...) but then completely changed character for the rest of the manga.