Nintama Rantarou: Tengu no Himitsu to Kieta Taiyou no Dan

A rumor spreads through Ninjutsu Academy that a tengu has been seen in the forest behind the school. Fascinated by stories of the creature's supernatural powers, Rantarou, Kirimaru, and Shinbei head out to investigate, expecting a mysterious ninja adventure and quickly finding more questions than answers.

Their search becomes tangled with a strange visitor and an unusual event in the sky. As fear and folklore mix with what they can actually observe, the three students must use what they have learned to decide whether the mystery really belongs to the supernatural world or has a more earthly explanation.