Daichi is a very intelligent duelist. He uses highly complex mathematics to win his duels. He bested high score in the entrance exams, and now resides in the Ra Yellow dorm. He uses several deck combinations for his duels.

In the anime, Daichi has six decks each based on an Attribute (Fire, Wind, Earth, Water, Light & Dark). In the second year he merges all these decks into one. In the manga, Bastion plays a "Yokai" deck.

In the manga, Daichi has a crush on Asuka Tenjouin.