Kitarou, a ghost, spends his afterlife helping humans in need of his skills. He thwarts the plans of evil spirits who live to torment humanity.

Primary school student Keita Amano's curiosity is as innocent as any other child's his age. But when one day he decides to venture deeper into the forest, he encounters a small and mysterious capsule. Out from its depths comes Whisper. After 190 years of imprisonment, this ghost-like creature is glad that someone has been kind enough to set him free. He decides to reward Keita by becoming his guardian against supernatural forces. Whisper is one of many Youkai that exist in the world, and provides Keita with a special Youkai Watch, which enables him to see and interact with all the other Youkai. Youkai Watch follows Keita, Whisper and the cat spirit Jibanyan as they encounter Youkai, befriend them, fix all the trouble that they so often cause, and, with the help of the watch, use the powers of previously encountered Youkai to aid them. Young Keita may have been just an ordinary primary school student when he first encountered the Youkai, but the many adventures that follow his discovery provide him with invaluable experiences and precious life lessons that help him grow.

A mysterious string of disappearances on a certain train has caught the attention of the Demon Slayer Corps, and they have sent one of their best to exterminate what can only be a demon responsible. However, the plan to board the Mugen Train is delayed by a lesser demon who is terrorizing the mechanics and targeting a kind, elderly woman and her granddaughter. Kyoujurou Rengoku, the Flame Pillar, must eliminate the threat before boarding the train. Sent to assist the Pillar, Tanjirou Kamado, Inosuke Hashibira, and Zenitsu Agatsuma enter the train prepared to fight. But their monstrous target already has a devious plan in store for them and the two hundred passengers: by delving deep into their consciousness, the demon intends to obliterate everyone in a stunning display of the power held by the Twelve Demon Moons. [Written by MAL Rewrite]

Getting ambushed by rogue demons on the road is business as usual for the Sanzou party. But when their latest assailants turn out to be humans, the group is left dumbfounded. The mystery only deepens when they encounter a wandering priest, Hazel Grouse, and his imposing bodyguard, Gaty Nene Hawk. The pair hails from the far West, with Hazel using his powers of resurrection to aid grief-stricken villages. While his ability is greatly welcomed by the people, the truth behind it is less miraculous than it seems. Furthermore, the resurrected humans gain golden eyes, a trait they share with the group's recent attackers. It appears that the friendly priest's intentions are not as generous as one might expect—and the Sanzou party is a step away from unraveling them. [Written by MAL Rewrite]