What's there to be confused about? They're being attacked while on the way to fix whatever spell they're under after the sealed boxed game arc.
You're confused about the monster? Boy, this is a manga about aliens and ghosts. From the premise itself, its bound to be confusing
let me express my confusion man not everyone remembers all of the chapters to connect the dots like sorry i dont spend all of my time thinking about this manga and why everything happens that way
It's a manga with a story, if you don't try to understand the flow, what's the point of you being here?
i genuinely dont know