The protagonist, Tsukishima Jinbei, strives to be a warrior who wins every battle until the day he dies. Jinbei has left his homeland in the Tsugara Domain to join the Mushibugyo in the great city of Edo. His job in the Mushibugyo is to exterminate giant bugs that run rampant in the city. Jinbei fights with the Mushibugyo, an office of brave men who risk their lives to protect the peace in Edo and the smiles of the people! Honesty does pay off!