Naruto: Shippūden (2007)

S3E63 The Two Kings

Asuma oversees Naruto and Sora's training with wind chakra and quickly realizes that Sora possesses a chakra as formidable as Naruto's. Meanwhile, Tsunade and Yamato hear from Chiriku about Sora's unintentional involvement in the destruction of the Temple of Fire. Later, Asuma gifts Sora a claw crafted from the same material as his chakra blades. It's revealed that Asuma was responsible for the death of Sora's father, Kazuma, who had intended to assassinate the Hokage. Furido confronts Sora, accusing Asuma of killing his father and handing him two "king" pieces from a Shogi set meant for Asuma. In the midst of this, Danzo mysteriously vanishes. Naruto finds a furious Sora in the training grounds, who effortlessly launches a chakra-infused kunai, obliterating a tree and the stone behind it.