What about Reimu's place...?You're sure taking that for granted...Cirno, pass the poc◯y.Wouldn't it be okay if we brought the ingredients?yeah~absolutely not, right?Ah~ so peaceful~yeahI know!No, I'm fine, although it's been pretty cold recently......fine with me, thoughACHOOO!Wazzat? You caught a cold, Wriggle?Let's have a nabe party tonight!Huh, is it cold?She's not going to let us in. (-_-;)Let's invite Mysty and the rest too!......that's probably 'cuz Cirno doesn't get cold...So out of the blue again.Are we doing it here? Won't it be too cramped?even though we're sort of like enemiesLeft behind by the seasonsIt's not mystery nabe「闇鍋」 lit "darkness nabe" — hot pot of weird mystery ingredients; generally as a humorous potluck gimmick. See: examples.
Title plays on the fact that Rumia suggested it.