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Shinobi: Heart Under Blade, also known as Shinobi: Akakaze no Sōrō, is a 2005 Japanese anime film directed by Masakazu Suzuki and produced by Studio Fantasia. The film is based on the Shinobi manga series by Masaki Segawa and Kazuhiro Fujita.

Shinobi: Heart Under Blade explores various themes that are characteristic of the ninja genre. One of the primary themes is the importance of friendship and camaraderie among ninja. The film showcases the strong bonds between the characters, particularly Ataru and his friends, as they navigate the challenges of their ninja training and confront their enemies.