Parent story: Mushibugyo
As giant insects lay waste to the land of Edo, the Insect Magistrate Office gathers powerful warriors to defend the populace from the invading threat. A rookie swordsman named Jinbei Tsukishima seeks to atone for past sins by joining their ranks, but he’ll need to prove his worth if he wants to find redemption and curb the insect infestation.
(Source: Sentai Filmworks)
Alternative Titles: Joujuu Senjin!! Mushibugyou OVA, ムシブギョー 虫奉行 OVA