The Ryuto Clan's lawyer known only as Doi (土井?) sold out the organization to the Chitoitsu. After killing Kawamori Yoshio using one of Antonio's bombs, he went to Chitoitsu to cash out and went into hiding. He was eventually caught by the persistent Gekioko Koko Kango-ka Generals, who then tortured him into revealing what happened on the night Antonio died. His near-dead body was later left under a bridge for public humiliation with the recording of his confession, which also includes some minor unrelated details like having a liking to Chitoitsu's translator: Lin. Doi was portrayed by Kawabuchi Yoshikazu.