Appears in <i>Rube Goldberg Machine</i> and <i>Tsuchinoko</i>. Hiroki used to have an interest in building Rube Goldberg machines. His entire family passed away in a disaster at sea. He is friends with Senri.
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Appears in <i>Rube Goldberg Machine</i> and <i>Tsuchinoko</i>. Hiroki used to have an interest in building Rube Goldberg machines. His entire family passed away in a disaster at sea. He is friends with Senri.
