The Hollowfication incident in the human world. Shiba Isshin and Kurosaki Masaki’s love story wasn't simple or peaceful, a lot of tragic events occurred. Aizen Sosuke, a character we are all too familiar with, indirectly triggered a Hollowfication incident in the human world, and Masaki became its victim. Hollowfication is something we've witnessed before. If a Shinigami gets affected, we don't need to worry too much since Urahara Kisuke can handle it, but for a Quincy, it's a completely different story. Quincies and Hollows have the absolute worst compatibility, meaning there is no easy or standard way to save Masaki. Because of this, Isshin decides to sacrifice himself. The connection between Yhwach and Kurosaki Ichigo. When Yhwach called Ichigo his child, we couldn't quite understand what he meant, but everything makes sense now. Yhwach is the progenitor of every Quincy, and since Masaki gave birth to Ichigo, Ichigo is directly tied to Yhwach's bloodline. To make matters even darker, Yhwach is actually the true culprit behind his mother's death. With Episode 12, we finally get a clear picture of Ichigo’s past and just how terrifying Yhwach truly is. Once his origin is revealed, Ichigo is able to stand tall once again and seize the opportunity to unlock his true power.