みっつ数えて「ゼロ」といったら does not mean when we say "zero" thrice. It's rather like when we count down from three to zero.
I'm not super good at English, so I'm leaving the phrasing to you.
They really disappear...What if she can't change back anymore?! Please stop!!Even Kaban is angry...Her ear fetish is that bad.Threeee
TwoooZeroZero
Zero
ZeroWaaaAaaah!?What are you doing!?Angry-pah!!For some reason, kemejiho sometimes adds "ripa" (りぱ) to the end of sound effects.Let's experiment right away.
Listen, Serval, we'll countdown from three and when we say "zero", you'll become a human, okay?