In Twilight's original memory, there is a certain node.
During a mission, he discovered a broken relic and obtained a formula for a secret medicine that could induce pseudo-death from the relic itself. This secret medicine could even deceive the marking on the Eerie Night Guest's hand and fool the Decayed Knight.
In that mission, Twilight was in a tourist city by the side of a mountain and a lake. The target was to hunt down vampires, and it seemed to be an important nest of the Blood Clan.
Casio narrowed his eyes in thought at the side of the yellow dining table.
He was trying to remember Twilight's blurry memories.