However, because Yorikazu TOKI, who was one of his family members, leaked the plan to his wife, who was a daughter of a bugyo (magistrate) at Rokuhara Tandai (an administrative and judicial agency in Rokuhara, Kyoto), the plan was exposed before it could be carried out, and he was assaulted by Noriyuki OGUSHI, who was working for Rokuhara Tandai.
しかし同族の土岐頼員が計画を六波羅探題の奉行の娘である妻に漏らしてしまったことから事前に露顕し、六波羅探題の配下である小串範行のよって夜中に急襲を受ける。