After 15 years (he is now 25), Arima recovered from the loss of his parents and after finding out about the demon slayers, he wanted to join them, he thought he would be killed because he was a half-demon, but he did not feed on people and had only increased endurance and strength than a human. Nevertheless, he was accepted, he began to study with Hashir voda, who sometimes said, "you are still very far from Hiro! ". Arima always asked, "Who is Hiro?" but all he heard was the teacher's laughter. So the years passed. Arima became a hashira of water. He remembered about the blade that his father had and wanted to find it...

Arima: