After the attack from Schiff
at the HQ, David
and the others move to Joel's
apartment in Paris. They stay here for a short while until David receives a tip-off from Solomon
about the all out attack on the Red Shield Headquarter
In the Anime
In Episode 28, Mao and Okamura are locked up and interrogated by David. They receive another attack from Schiff.
Episode 31, Mao and Okamura are left behind in the apartment after David brings Saya and the others back to the HQ. Kai leaves a note telling them that he will contact later.