Takeru Teshimine was first introduced during the Return to the Infinity Fortress arc. He came to visit Paul Wan in his coffee shop during the storm. However, not much was revealed until much later. During the Kiriudo arc, Teshimine appeared within the memories of Ginji Amano. Teshimine was teaching Ginji how to strategize with cards. He taught Ginji to never play a trump card too early, because if one does, then a stronger opponent will take you down. He taught Ginji to trust all of his cards, because even the cards that he think that are weak can make a difference.