the Black Numbers was in Rimuru Office, along with other Rimuru's official like Shion, Benimaru, Geld, Rigurd, etc.

"..." Diablo, quiet next to Rimuru, ready to take any order

"I don't care, I'm the best!" said Ultima, with her tongue out, mocking gesture.

"No! I'm the best!" said Carrera.

Testarossa calm and composed like usual.