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In an era when ninjas were revered as semi-divine rulers who maintained peace in Japan through their martial mastery, a forbidden hara-kiri ritual was performed by certain individuals, allowing their souls to be preserved at Kinkaku Temple for eventual resurrection. Over time, the true history of these ninjas faded into obscurity. Fast forward to a future dominated by advanced cybernetics and digital networks, where the souls of ancient ninjas have returned to haunt the shadows of Neo-Saitama. Fujikido Kenji, an ordinary office worker, witnesses his family tragically killed in a ninja conflict. As he approaches death, Kenji is overtaken by a mysterious ninja spirit. Reborn from this ordeal, he becomes Ninja Slayer, a vengeful hunter on a mission to eliminate malevolent ninjas while seeking personal justice. In the grim underworld of Neo-Saitama, Ninja Slayer battles the evil ninjas of the Soukai Syndicate.

In Japari Park, a vast natural preserve, human-like beings called "Friends" inhabit diverse landscapes. On a calm day in the savanna, the energetic Serval encounters an unfamiliar Friend. Curious, Serval investigates the newcomer, Kaban, only to find that even Kaban is unsure of her own species. As they travel together through Japari Park's varied terrains and notable sites, Serval and Kaban seek answers about Kaban's identity at the park's library. During their journey, they meet many other Friends, helping them along the way and witnessing their unique lives. Gradually, they begin to uncover the sinister secrets hidden beneath the park's surface and the nature of their existence.

In a future where "The World"—a mysterious location whose whereabouts are unknown—maintains global peace, making war a thing of the past, the airship Norn is assigned to carry nine people with special powers to this hidden place. Boarding the ship are eight men and three women. Koharu, who has moved past her loneliness and resents her potentially destructive abilities, works with Mikoto Kuga, a noble who uses her barrier skills to protect the Norn and its passengers. Also present is Nanami Shiranui, whose power causes her personal suffering and drives her desire to end her life as atonement for past deeds. As the journey unfolds, tensions grow among the passengers due to an unexpected rise in the ship's headcount. Their search for the stowaways is disrupted by a hostile attack aimed at stopping the Norn's progress at all costs. Amid this chaos, the passengers ponder the reasons behind their given abilities and their ultimate purpose upon reaching The World.