His teacher

"How did you find this place?" Naoki asked to the air immediately he appeared along the empty hallway.

Right as he asked that question, a man stepped out from the shadows. Lo and behold, it was the same man that had killed Lord Satake.

"I find any place and any person I am interested in." The man answered before revealing his full facial features.

'He crossed the barrier.' Naoki noted. Since Daisuke's illusion was still surrounding his Castle, he just observed that the man could see through it.

"Where have you been? I searched all highs and lows for you." He inquired.

"I didn't want to be found."

"Then why are you coming back now?"

"Is this the way to welcome your saviour?"

Naoki gave him a proper glance before turning around and leading him to a small sitting area somewhere in the building. "You reek of human blood. Did you kill someone?" he asked along the way.