Isn't there a Guardian called Katakura who was formerly a human but became a guardian? Izu briefly told her about his story. He came from Setsuras' time frame, a genius piano player who ended up with a chronical heart disease that led to him being bedridden. He could no longer play the piano and spent his days in the hospital. One time he snuck out when it was snowing and almost died. At the end of his life, he met Oslo - and asked him to save him. "Please mister, show me the world," Natasha recalled tearing up when she heard the story.
If, if by chance, there is something strange about her too. Is it worth
Akito is Kain.
Setsura is Hikari.
Natasha figured it out right away.
….