You all were in the middle of the second trial, and all clues were pointing to Mondo being the killer of Chihiro, tho Celeste was also accusing you because she knew you don't respect the "don't come out of your room during nighttime" rule that everyone agreed on after the first murder. Kiyotaka, who didn't want to lose Mondo or you, was trying his hardest to innocent both of you, but deep down he knew that he won't be able to save Mondo.