Saiki Kusuo no Ψ-nan 2 - episode 23 - 19 Jun, 2018

Kusuo attempts multiple time travels to back when he was in second grade and when a student named Takashi had bullied Touma but young Kusuo had helped Touma in many ways (healing his wound, causing Takashi to spin around a bar, and causing a classroom mess), leading to Touma's suspicion that Kusuo was a psychic. However, the attempts either do not change the present situation, or have a butterfly effect leading to a post-apocalyptic world. He relents and tells Touma that he is indeed a psychic, and Touma thanks him for all his help. (Source: Wikipedia)