I don't think Tatepon is stupid enough to trust Kanoko like that. I'm sure he's just playing her, to get her to feel that she's going to get what she wants. Sumaoka's realized just how unhinged Tatepon has become, and sadly Missy over there has no idea what's happening.
Who does Fukuchi plan on using the drug on? I doubt he's stupid enough to use it on himself.