People (besides Brackass) don't seem to realize this so I'm going to point it out:
Look at what Kai is saying to Yoshiki.
Then look at what Kai is texting on his phone.
Then look at what Yoshiki says about Taguchi, and how Kai responds to that.
Kai is lying his ass off to Yoshiki.
- "Taguchi is safe" -> no he's not, Kai shot him several times. Kai is there safe and sound, so Taguchi is probably actually dead.
- "ex-Bakushinchi guys are looking for Kenzou" -> no they're not, Kai has someone out looking for him who he don't want to be seen by anyone from Kyoranki.
- "Make sure Kenzou is taken alive" -> Kai says "of course", while explicitly instructing mystery girl to kill him.
Yoshiki thinks Taguchi is still on Kyoranki's side, which is why he's worried Kilihito will find him. He's actually genuinely worried for Taguchi's safety, not knowing Kai has probably killed him already.