grass / a weed / a herb / a scout, a spy (from the way one would hide in the grass to observe enemy troops) / (figuratively, slang, rare) pubic hair

(idol fandom) fan who is regularly spotted at events

舞う: dance

魔王:

前橋: Maebashi

right behind

every / each

the devil, devil king / archenemy / (fantasy) leader of the underworld

mat

matte