Cleaving insects in flight with one's sword was once an impressive display of samurai skill, but since Japan was invaded by the bug-monsters known as the "Mushi", it's impressive just to survive a battle with one. That's the task of the Mushibugyo, the warriors who specialize in fighting the insect scourge, and to erase a stain he brought upon his family's honor, young Jinbei Tsukishima is determined to join their ranks. It won't be easy, and the young swordsman has his work cut out for him impressing a team that includes a female ninja with a knack for explosives, a master of shikigami magic, and a roster of other powerful fighters. On the other hand, a certain beautiful and well-endowed innkeeper he rescues quickly becomes a fan, so at least there are some perks to becoming a MUSHIBUGYO.