The Secret of the Haunted Castle

The parents of young Justus were scientists who studied nature and the environment and were often away on fieldwork. They unfortunately perished during one expedition, leaving behind only a video recording made just before their death, which indicated that the matter was related to a mysterious castle. To uncover the truth, Justus and his two friends, Mouse, established a detective organization, using the prize money Justus won in a competition to embark on their adventure. After deciphering the clues left by his parents, they finally located this enigmatic castle. Subsequently, they encountered many strange people and bizarre events there.