The classic "The Fiend with Twenty Faces" appears in the adventure game! Players take on the role of Kobayashi Boy from the Boy Detectives Club and solve four difficult cases. Checking the words that give clues to the case will turn them into puzzle pieces, and by collecting and combining these pieces, you will be able to see the truth behind the case! In addition to the main story, it also includes a 51-question mystery quiz mode and the Akechi Case Files!