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Masayuki Onodera, real name Toru Suga was a travel agency employee from Tokyo. He was the son of Minoru Suga and Midori Madarame. He killed the Madarame family because Shimon Madarame, the head of the family, stole his father's research, which made his father commit suicide. He killed his mother's daughters from her marriage with Madarame as a revenge for not taking care of him.
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His mother, Masayuki originally held resentment towards her for supposedly abandoning his father, even going as far as taking the lives of Ruri, Tateha, and attempting on Ageha. Masayuki soon realised the mistake he made when he found out that his first two victims were actually his full blooded siblings.