The Hidden Dungeon Only I Can Enter

The Hidden Dungeon Only I Can Enter (俺だけ入れる隠しダンジョン 〜こっそり鍛えて世界最強〜, Ore Dake Haireru Kakushi Danjon ~Kossori Kitaete Sekai Saikyō~) is a Japanese fantasy light novel series written by Meguru Seto and illustrated by Note Takehana.