ストレンヂア -無皇刃譚-

A nameless ronin known only as Nanashi takes work as bodyguard to Kotaro, a boy fleeing across Sengoku-era Japan with his dog Tobimaru. Warriors of the Ming Dynasty are hunting the child, and their pursuit turns every stretch of road into an ambush. Nanashi has bound his katana to its sheath and sworn never to draw it, but keeping Kotaro alive may cost him that vow.