Hart Tenjo

Haruto Tenjo is Kaito Tenjo's brother. It is said that Haruto posseses a mysterious and strange power that can create paths to alternate realities.

Biography
Even though Haruto hasn't debuted on the anime, it is known that he has fallen sick which is reason for why his brother is on the search for the Number cards, as Kaito is told they are the reason for Haruto' illness.