Yuusei is Isaac di Maria's son and Ichirou di Maraa's father. He raised Ichirou all by himself. Just like his father, he was an exorcist and a researcher. Yuusei was killed when Ichirou was younger. [spoiler] - He conducted studies on immortality - He was object of studies himself - He wasn't a normal child, he was a clone created by Isaac
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Yuusei is Isaac di Maria's son and Ichirou di Maraa's father. He raised Ichirou all by himself. Just like his father, he was an exorcist and a researcher. Yuusei was killed when Ichirou was younger. [spoiler] - He conducted studies on immortality - He was object of studies himself - He wasn't a normal child, he was a clone created by Isaac
