Reading it, Goemon discovers that he is a son of So Sokei and So Sokei was killed by Hisayoshi MASHIBA; in fact, Goemon had been trying to avenge the murder of his adoptive father Mitsuhide TAKECHI on Hisayoshi previously.
読むうちに五右衛門は、自身が宋蘇卿の子で、かねてから養父武智光秀の仇としてつけ狙っていた真柴久吉が実父の仇でもあることを知る。