- HD 1080
- Runtime: 107m.
- Status: Released
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- Languages: ja
- Country: Japan
- Director: Ten Shimoyama
- Stars: Yukie Nakama, Joe Odagiri, Tomoka Kurotani, Erika Sawajiri, Lily
- keywords: japan, samurai, ninja fighter, forbidden love, samurai sword, japanese soldier, code of the samurai, japanese royal family
- Production_studio: Yomiuri Telecasting Corporation, Eisei Gekijo, Shochiku, Nippon Television Network Corporation
- Slogan: Fated to love : Destined To Kill.
- providers: Crunchyroll, Crunchyroll Amazon Channel
- The Shinobi: Heart Under Blade is featured in the top rankings of 2005
- #26 in Top Action Movies of 2005
Even though Gennosuke and Oboro are from rival ninja villages, they are secretly in love. At an annual conference with the Lord, it is dictated that a competition--a fight to the death--will take place between the five best shinobi from each village. Gennosuke and Oboro's love is made even more impossible when they each got picked as the leader of the five to represent their respective villages.