User blog comment:Xilinoc/Everything but the Rain op. 9 - "June Truth"/@comment-5551986-20130508134235/@comment-5551986-20130509233644

Agreed. The past few chapters where more or less how he met Masaki. The next two I reckon will reveal the cause of her death. It won't really continue. Infact, I'm semi-hoping it gets summed up in one chapter, I like learning about the past. But only to an extent.

If Aizen is the culprit either Masaki defended Ichigo against some special hollow, or even Aizen himself. The only reason I would assume Yhwach (and other quincy) would be partly responsible is because she basically married a shinigami, a Quincies rival. And she is part hollow another enemy of a quincy. If they didn't aim for her, they most surely targeted Ichigo maybe due to his lineage and a potential threat. Or because in the eyes of a Quincy, he is an abomination, especially quincy as proud as Yhwach, considering he knows a fair doosey about Ichigo, I wouldn't be suprised if he had a hand in it. Then again, the Kurosaki family was a Quincy family. Hell, why don't I throw some crazy in this post and hint that Yhwach's surname is Kurosaki.