Katanagatari

Synopsis

In an abandoned lake, the duo find the next sword roaming around as a robot. Togame gathers information and attempts to capture the robot by setting traps for it, all of which fail. Shichika eventually fights the robot but it blocks and dodges all his attacks and surprises him with unusual attack patterns. Finally, the robot jumps into the air just as it runs out of energy, and Shichika swoops in to catch it, later sending the doll off to Princess Hitei.

(Source: Wikipedia)