Is Nobunaga no Shinobi: Nobunaga to Minarai Shinobi hentai?
English title: Ninja Girl & Samurai Master: Episode 0
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2016 · 1 episodes · PG-13 - Teens 13 or older
Comedy, Historical, Seinen
Oda Nobunaga saves a girl from drowning one day. She clumsily tells him that she's a shinobi. Instead of attempting to kill him, she swears to serve him one day after hearing his plans to unify Japan. (Source: Crunchyroll)
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