4 : Inside: Evil Spirit Here

Reigen’s ability to see through Minori’s "possession acts" before the real spirit is revealed showcases his mastery of human psychology. Mob Psycho 100 Season 2, Episode 4: Inside ~Evil Spirit

It forces Mob to question whether he can truly live a normal life without relying on his powers. 4 : Inside: Evil Spirit

Reviewers on Dragon's Talk and Wooder On highlight several reasons for the episode's impact: The episode centers on Shigeo "Mob" Kageyama and

Realizing he cannot defeat Mogami from the outside, Mob performs an "out-of-body" experience to enter Minori’s body and confront the spirit within. 4 : Inside: Evil Spirit

The episode centers on Shigeo "Mob" Kageyama and his mentor, Reigen Arataka, as they are hired by a wealthy client to exorcise a spirit possessing his daughter, Minori. They soon discover the entity is , once a legendary psychic who turned into a vengeful spirit after a life of suffering.

The episode leans into psychological horror, departing from the show's usual comedic tone.