Head canon for this scene:
Rin: Nico-chan! What are you doing here, nya?
Nico: Playing Santa for Maki-chan, duh. Now get out of here! I was here first!
Hanayo: Uhm…
Nico: Gah!
Rin: Kayo-chin! You’re here! Now Maki-chan has three Santa-sans!
Honoka: Eli-chan, you’re here too?
Rin, Nico and Hanayo look over to see Eli in the doorway, looking back to the hall.
Honoka and Eli enter the room, both wearing Santa outfits.
Eli: Looks like we all had the same idea, but we’re still missing…
Kotori enters room, out of breath: Sorry, I’m late. I forgot how big Maki-chan’s house was… and where her room was…
Rin: Umi-chan is holding the ladder for me. She won’t come up because she says the outfit is embarrassing.
Nico looks around the room. Her eyes fall on the closet: So that must mean…
Nozomi puts down her camera as the door opens: Oh, Nicocchi, you found me.
Nico facepalms: Look guys, let’s just do our thing and get out of here. I’ve no idea how we haven’t woken Maki-chan up yet. Rin, close that window or she’ll catch a cold.
Nozomi: Nicocchi, how thoughtful…
Nico: Don’t start with me, Nozomi.
Maki murmurs in her sleep: [Insert name]
All seven girls stare at the redhead: …
And then the fight started.