Sgt. Frog Episode 132: Dororo - The Chance is Important! / Natsumi - My Bluebird
Episode 132 of 358 of Sgt. Frog, aired October 20, 2006, 25 minutes. Available with English subtitles and dub where released.
Episode summary
A trainee assassin gets sent to take on Dororo for a graduation exam. But how can he possibly defeat such a powerful assassin?! Then Natsumi finds a bluebird she wants to keep as a pet. Source: crunchyroll