Even if I'm not a fan of the mask trope (I'm sure it has a name), the twist pretty much redeemed the show for me. It explained why Takei was so scared of the butler, why "Shigemaru" revealed his face to Suzue and was able to kill Takei and Cho so easily (he was another anime super butler). The grandmother being the mastermind is a way better twist too. Good stuff.
Really liked how the ending mirrored the ending of the first episode. Some things never change
I'm disappointed they never told us how exactly Suzue is related to Daisuke. Pretty sure she's his cousin, but we never got confirmation.