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I love you very much, Miwa. And while I would hate to see those beautiful eyes filled with so many tears, I must see that you have a world to live in, for you and Makoto. Please forgive your idiot brother.
Before the start of Momentum Shift, Isamu used to live with his mother and father, however, at some point he was kidnapped. However, Jubei managed to save the young lad before any harm could befall him. With that, Isamu began to train with Jubei, and not long after that he met Téakaka. He is likened to a 'guardian angel' by Téakaka.
Isamu sought out Hiroshi in order to pursue his inevitable fate. This brought him face to face with Miwa, in which he was forced to explain why he had avoided her. Miwa did not take the news well, and Isamu was forced to take drastic measures in which he took her sword from her. He then headed up to the roof of the NOL building to find Hiroshi. The two dueled until they were both bloodied by attacks. However, when Miwa reached there, she revealed the Pink Azure, and broke through Hiroshi's barrier in order to save Isamu. Unfortunately, her Azure couldn't interfere and Isamu wished her farewell as he and Hiroshi continued the cycle as they died.
He tends to be quiet usually. However, he has been known to carry on long conversations with people he does know, such as Jubei or Téakaka. It can be said that he is a conisseur of food, as he and Téakaka have been to many places and they both can cook five-star meals without even trying. He is known to take the mentor role. He taught Téakaka everything she knows which was passed down to him by Jubei.