Niji No Shogai Shinsen Gumi Giyu Den Ka (Shodensha Bunko)

[Machine Translation] The Shinsengumi's four former guardians, including Watada Shozen, were assigned to work in the shadows of the Shinsengumi. The Shinsengumi quickly made a name for themselves, but after the Ikedaya Incident, they were soon left behind by the current of the times. Seeing the spirit of the samurai in Isamu Kondo and Toshizo Hijikata, Shozen and the others accompanied them from Kyoto to Aizu and Hakodate, and fought together with them. In order to find the path of death, and for the sake of the fallen Shogunate, the retired old men fight to the death against the times and their age!

新選組の陰供の任に就くことになった、和多田主膳ら元御庭番の四人組。瞬く間に盛名を轟かせた新選組だが、池田屋事件を境にやがて時代の流れに取り残されてゆく―。近藤勇、土方歳三に武士の魂を見た主膳らは京から会津、箱館までも同道し、共に戦い抜く。死出の花道を探すため、そして落日の幕府のため、時代と年齢に抗い、隠居老人たちが死闘を繰り広げる!