Happy Halloween~!

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Happy Halloween from the team of four~!!

Guess who they're dressed as? :3

I'll give the anime titles (the ENGLISH TITLES) as initials in order or left to right for hint:-
BB , SPMM , AitCoH , PH

Person who gets all of it first gets a cookie~(/ﾟДﾟ)/

Characters in order from left to right -
Decessus, Shiyori, Taiishi, Ishitai

Characters & Art (c) Me
Cosplayed characters belong to their rightful owners :3