He was the top warrior of Mibu-Roshi (Mibu masterless warriors group), but there are few references and traditions concerning him, most likely due to the fact that he was violently hated by Isami KONDO (There still remains a document which says that Kondo killed Tonouchi out of this hatred).
最初の壬生浪士の筆頭格であったが、近藤勇に激しく憎まれた（近藤が何らかの憎悪を抱き、殿内を討ち果たした、という書簡が残されている。）せいか殿内自身の資料・伝承に乏しい。