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Originally Posted by gbatemper

Also spoiler your shit

Heres some speculation based off the PV (MAJOR SPOILERS)

Spoiler:

We don't know yet. In the newer chapter of the LN, Yui is down with a pool of blood. The PV'S spouts several death flags, suggesting the majority of the main cast will die.

Or She may not die e.g. Yuuya may show some TLC for hospitalised and sleeping Yui.