|Title||Gokumon Banchou (獄門番長)|
|Likes||Walks, His sweetheart Chiyo Akiyama|
|Fighting Style||Ancient Martial Arts|
|Manga Debut||Chapter 11|
Masamune Gokurou, known also as Gokumon Banchou (獄門番長, lit. Prison Gate Banchou), is the Shirayukinomiya family butler and Kobushi's private cook who supports her completely. He is a very fast cook able to make a Chanko Nabe in seconds and also he is protective of Kobushi as a father would be. He also seems to have extreme combat ability, able to defeat several of Machine Banchou's robot underlings easily, something that interests Akira.
During World War II he was a chosen member of the Yatagarasu project. He was a comrade of Homura Kongou, whom he refused to kill to become the final participant of the project. He and Homura were saved from execution by intervention of General Shirayukinomiya, the grandfather of Kobushi Shirayukinomiya. He subsequently became the Shirayukinomiya family butler in an attempt to repay his debt.
During the Great War he was rumoured to have fathered a child with his lover, Chiyo Akiyama before she passed away, but this has never been confirmed.
- Gokumondai (獄門台, lit. Prison Gate Post): Repeated kicks so ferocious they leave behind phantom images, mowing down life and spirit alike!
- Shinigami no Kama (死神の鎌, lit. Reaper's Scythe): An incomparably powerful spinning kick which is so fast that it also creates a shockwave.
- Yata no Kagami (八咫鏡, lit. Yata's Mirror): Reads the opponents thoughts and mannerisms from their movements and copies them perfectly.