Episode 17

"Discord ~Choices~" is the 17th of the Mob Psycho 100 anime adaptation, and the fifth episode of the second season.

Synopsis
Mob gets trapped inside a parallel world created by Keiji. Minori ends up transferring to his class, and Mob becomes the target of bullying. He can't ask anyone for help, and his negative emotions start to build up inside. The truth behind Mogami's tragedy when he was alive comes to light. Meanwhile, Reigen and the others were waiting for Mob to regain consciousness at the Asagiri mansion. Dimple attempts to save Mob by infiltrating Minori's body.

Plot
Keiji explains that he was a psychic like Mob. When he was alive, his mother had fallen ill. Keiji undertook extreme jobs (ex: not sleeping enough to kill people) to pay for his mom's treatment. His mom died of unknown reasons, but she blamed Keiji for her death. Keiji then committed suicide and became an evil spirit. Keiji, disguised as Minori, also transfers into his class, and she leads her classmates in constantly bullying Mob. The high schoolers that bullied Mob earlier also show up, and Mob is powerless to stop them. Even Ritsu is a stranger in this world, and he does nothing to help Mob. Over the course of 30 minutes in the real world, Mob experiences 6 months in the mental world with all of his negative emotions building up. After an incident where Mob is powerless to save a stray cat from Minori and her friends, Mogami explains his backstory and why he despises people who use others. Dimple manages to use Mob's powers to open the door and let the other psychics go free, but he stays and decides to go into Minori's body and save Mob. Meanwhile, Mob gets beat up by Minori and her friends, so Mogami gives him his powers back. Mob immediately turns the tables and is about to kill one of the bullies. Dimple shows up and brings Mob's memory back. Mogami then reveals that the people in this world are actually all of the spirits he had absorbed. They start attacking Mob, who is determined to save Minori at least. Mob unleashes the power of his courage on Mogami and defeats the army of spirits. Mogami's defeat releases a mass of spirits that even he cannot control, which proceed to destroy Mob's body. Mob is eventually overwhelmed by the monstrous conglomeration of spirits, but reaches ???% and blasts the entire mental world apart. Mob wakes up in his own body. Mogami leaves Minori's body and attempts to leave the Asagiri residence, but Matsuo captures him into a flask, renaming him Pudding-chan. Minori wakes up and walks up to Mob. She could see everything that happened in her head and saw how Mogami portrayed her. Mob asks her if she actually acted like that in real life, which she confirms. Minori starts crying and apologizing over and over again. Mob says it was okay because now he sees that people could change.

Manga and Anime Differences

 * In the manga, the cat that Kageyama tries to defend is beaten bloody, while in the anime, he runs away. Additionally, Shigeo lost one of his teeth in the manga.
 * The scene where Minori stabs Mob with a knife is omitted.
 * In the manga, Matsuo, after catching Keiji, calls him "Pudding-chan".

Notes and Trivia

 * The episode doesn't have the usual ending; there are normal scenes with music in the background.