Gintama: Yoshiwara in Flames

Synopsis

Odd Jobs trio Gintoki, Shinpachi, and Kagura are hired by a young boy named Seita to find his mother in the underground red-light district of Yoshiwara. This hidden city, built beneath the Earth's surface to block out the sun, is ruled with an iron fist by the fearsome "Night King" Hosen, a legendary warrior of the Yato clan.