Are the firefly worms a censor of some sort?

Doesn’t look like worms most of the time tho.

For those who forgot about the rose already, check episode 1 where they explain it around the 20-minute mark.

Also relevant in the same episode:

• Alicia’s age is seven when she first noticed she got isekaied.
• Alicia’s mom briefly mentioned the rose.

Oh no, we are heading to the opening scene of episode 1.

He lost it all because of ISM.

Surprisingly, this magic-dominant world is microbe-aware as we see the lunch lady wearing a mask.