Layton Mystery Tanteisha: Katori no Nazotoki File (Layton Mystery Detective Agency: Kat's Mystery Solving Files) takes place during the events of 'Layton's Mystery Journey: Katrielle and the Millionaires' Conspiracy'.。科罗拉多州的曼尼通斯普林斯市求助于加密动物学家Mountain Mike，将他们从邪恶的加拿大大脚怪等人中拯救出来。。