SPOILER
1. Joseph was the one who caused the apocalypse in ending 9 haha. Ivy....is alive in a sense.
Aww, thank you for answering my question! Actually, I have to say sorry about how I stated my question ambiguously. I knew that Joseph is the cause of the Apocalypse, but what I wanna ask is how they keep relationship after Apocalypse like are they still together or something?
Btw, if it means the spoiler of your next project, please nevermind to ignore the question (x_x; )