Rurouni Kenshin

The Birth of a Boy Swordsman: The Battle of First Apprentice Yahiko (1x12)

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Yahiko meets a cute girl named Tsubame, who works at the Akabeko. She's being forced into making a copy of the key to the Akabeko by a group of thugs, and Yahiko decides to help her by himself. He defeats the thugs, although with a little help from the group.