Nekosogi Radical

The final arc of the original series begins. A man in a fox mask, Takashi Saitou, gathers a group of dangerous individuals known as the Thirteen Stairs, with the aim of bringing about the end of the world's story, and he has his sights set on Ii-chan. Old faces return and new enemies appear as Ii-chan is forced to stop running from the conflict. (Source: NISIOISIN Wiki)

Uprooted Radical (Part One): The Thirteen Stairs (Original: Nekosogi Rajikaru (Jō): Jūsan Kaidan), Uprooted Radical (Part Two): Overkill Red vs. The Orange Seed (Original: Nekosogi Rajikaru (Chū): Akaki Seisai vs. Daidainaru Shu), and Uprooted Radical (Part Three): The Blue Savant and the Nonsense User (Original: Nekosogi Rajikaru (Ge): Aoiro Savan to Zaregoto Tsukai) are the seventh, eight and ninth