Safety Warning for Companion App

[Jijifli]

That is hilarious. I love the cartoony sound effects. Could someone tell me what the sign that Alpha holds up says?

Edit: It looks like it says kikeso. But the font makes it hard to match up to my katakana book. xD Also even if it does say that I have no idea what it means.

I dunno what word it is, but I'd assume that, based on the message it's trying to pass on, it's basically a way to say "No" or "Don't do this." He only holds it up after they do the wrong bad thing.