Wandering Clouds

It tells the story of a retired samurai, Kumosuke, who is living quietly, not to say idly, in Edo with his wife and two children, a young boy named Shinnosuke and an infant girl, Ohana. While he nominally runs a courier business to earn a living, he seems to spend most of his time smoking his pipe, drinking sake, and chasing women. The arrival of a Shinsengumi squad led by a young swordswman, Ichimonji Hyougo, disrupts this peaceful routine. Kumo is forced to use his still-sharp sword skills to defend himself, but he'd basically prefer to stay out of the treacherous political currents. Nonetheless, he ends up saving Ryouma Sakamoto from the Shinsengumi and teaching Ichimonji the futility of the warrior way. (Source: MyAnimeList)