The Secret of the Haunted Castle

The parents of young Justus were scientists who studied nature and the environment and were often away on business. They later tragically died in an accident during an investigation, leaving behind only a video tape they recorded before their death, which indicated that the matter was related to a strange castle. To uncover the truth, Justus and his two friends, Rat, established a detective organization, using the prize money Justus won in a competition to start their adventure. After deciphering the clues left by his parents, they finally found this mysterious castle and subsequently encountered many strange people and bizarre events here.