I thought vampires couldn't see themselves in mirrors?

Could somebody please help me fill in the blank?

そんな訳で?近な
所から調査ウサ

Also, I'm still trying to pinpoint the exact meaning of 荒ぶる.

Your missing kanji is 身 (mi) for body. 身近 (midika) would then mean 'around oneself'. For 荒ぶる, I'd just go with 'evil'.

A) 身
B) savage, fierce
BONUS) Teruyo is a nickname for Kaguya (using other readings for 輝夜)
BOSS STAGE) the text at the bottom right says 迷探てゐイナバ (parodying 名探偵コナン)

Thanks for your help, guys.

And sorry for flagging your comment for deletion, Akari. Really, it happens all too easily.

While editing, I realized that jpeg format really did a number on this image.

I don't have a pixiv account, though - pity.

Remilia is going to put Sakuya in the hospital because of almost innocent intentions

Woo? Suddenly Rick Flair! Uu~! is the way to go.