Saiki Kusuo no Ψ-nan: Kanketsu-hen

Kusuo Saiki has secretly prevented the same catastrophic volcanic eruption again and again by resetting time, buying Japan one more year each time. As the deadline returns, he decides he cannot keep trapping the world in a loop forever and begins preparing to stop the disaster permanently.

Even for the world's most absurdly powerful psychic, concentrating on a planetary crisis is difficult when Nendou, Kaidou, Teruhashi, and the rest of his friends keep filling his days with nonsense. Saiki must finally use everything he has learned about his powers while confronting an uncomfortable truth: he has become far more attached to this ridiculous life than he likes to admit.