Fanboy and Chum Chum ruin Selkie (Roll Light)'s birthday/Beaten up by Mimirin Midorihara's very loud crying

Plot:
Cuphead gets a report about Selkie's birthday. So he told Fanboy and Chum Chum to go to Selkie's birthday party and behave or else they'll be grounded and beaten up by Mimirin Midorihara's loud crying.