With his younger brother, Ritsu, seeking more indepedence, Shigeo is forced to navigate through interpersonal relationships to understand why people want to change, and why he doesn't. [Saiki and Mob character swap; full summary, notes and warnings inside] [Part 1 of The Older Brother of the Younger Brother series]
Kaidou has changed for the better. So why is it that just when he got his life in order, bizarre, suspicious things start to happen around him? Maybe it has something to do with the fanfic's plot. The blatant reference in the title sounds like a major hint, too. I, ordinary psychic, Saiki Kusuo is on the case.