Blue-san, -- [don't know the rest. Translations have been taken from http://jb2448.info/Fanart/konbu-doujinshi]

Trick or treat!

... eh?

No candy, eh? Guess it's a trick then!

Bl-Blue-san!? Wait a sec--!

I guess today was Halloween, huh?

Yep. It's the day when you're supposed to give out candy ♥

It's embarrassing to cosplay, but I can show off to Green and sell it for a good price later, so it's two birds with one stone.