Keita Amano, a primary school student, is as curious as any other youngster his age. However, when he decides to go deeper into the jungle one day, he comes across a little and enigmatic capsule. Whisper emerges from the depths. This ghost-like creature is grateful to have been set free after 190 years in captivity. He chooses to thank Keita by taking up the role of his protector against magical powers. Whisper is one of the numerous Youkai that live in the world, and he gives Keita an unique Youkai Watch that allows him to view and communicate with all of them.