Found on a corpse in the Abandoned Dungeon, in a small enclosure on the left, after entering the dungeon.
Trivia[]
- It is speculated that the letter was written by Kotaro's father, who, as Kotaro explains, was sent to the Abandoned Dungeon for doing something "bad". This line of dialogue is only available if he is told to go to the dungeon as per Doujun's request.