Rokumon Tengai Mon Colle Knights

Professor Hiiragi discovers another world where humans and monsters coexist, and his daughter Rokuna and her friend Mondo eagerly explore it. Count Collection makes the same discovery, but intends to enslave its creatures and use them to conquer the human world.

His plan depends on six items capable of opening a passage between the worlds. With the help of the monsters they befriend, Mondo and Rokuna become the Mon Colle Knights and race to stop the count from turning a place of wonder into the source of his army.