Setsuko

Setsuko Izayoi is the mother of Akiza.

As the same case as his husband Eiyu, she hasn't oficially debuted, but instead been seen over flashbacks on the series because of the terrible incident 13 years, involving Eiyu and their daughter's psychic dueling powers.

As she was present during the duel on where Akiza's powers were awaken, as they were responsible for that her husband would be thrown and smashed against a wall. After that event it is because of those same terrible powers, that Eiyu and Setsuko couldn't accept Akiza anymore and eventually ended up rejecting her.

It is known that only after Akiza's duel against the Dark Signer, Misty Lola from which she results to be left unconscious, that both Eiyu and Setsuko will be seen.