Heck yeah, Party Battle against literal Hidden Boss opponent here we go. Thanks so much for the really quick translation too!
Interesting that Aki and Chiaki are continuing to get closer, power up from that will be fun to see. Seems like this Marom is a prototype for the next level being the brother and sister were trying to create, though something still went wrong with it. Wonder if it's the sister herself transformed ala the Demon Lord, or they copied their minds/souls somehow and changed bodies or what. Next few chapters will be fun, she looks powerful enough to actually push this team, so we'll get to see how they all use their various special strengths. Aki presumably still has her crazy fast speed but not a ton of power behind it, Goblin of course is maxed out, Demon has her time h4x and general magic knowledge. Granite is the one who right now we haven't seen the growth of in a bit, since the candle demon battle.