4 : Inside: Evil Spirit -

It forces Mob to question whether he can truly live a normal life without relying on his powers.

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 4 : Inside: Evil Spirit

Reviewers on Dragon's Talk and Wooder On highlight several reasons for the episode's impact: It forces Mob to question whether he can

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. They soon discover the entity is , once

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.

While Mob's spirit is inside Minori, he leaves his physical body vulnerable, protected only by the spirit Dimple. Why This Episode Stands Out

Unlike previous "villains," Mogami challenges Mob’s core pacifist philosophy. He argues that human nature is inherently ugly and that Mob's psychic powers should be used for himself, not for others.