Shigeo Mob Kageyama is now maturing and understanding his role as a supernatural psychic that has the power to drastically affect the livelihood of others. He and his mentor Reigen Arataka continue to deal with supernatural requests from clients, whether it be exorcizing evil spirits or tackling urban legends that haunt the citizens. While the workflow remains the same, Mob isn't just blindly following Reigen around anymore. With all his experiences as a ridiculously strong psychic, Mob's supernatural adventures now have more weight to them. Things take on a serious and darker tone as the dangers Mob and Reigen face are much more tangible and unsettling than ever before.

Eighth-grader Shigeo Mob Kageyama has tapped into his inner wellspring of psychic prowess at a young age. But the power quickly proves to be a liability when he realizes the potential danger in his skills. Choosing to suppress his power, Mob's only present use for his ability is to impress his longtime crush, Tsubomi, who soon grows bored of the same tricks. In order to effectuate control on his skills, Mob enlists himself under the wing of Arataka Reigen, a con artist claiming to be a psychic, who exploits Mob's powers for pocket change. Now, exorcising evil spirits on command has become a part of Mob's daily, monotonous life. However, the psychic energy he exerts is barely the tip of the iceberg; if his vast potential and unrestrained emotions run berserk, a cataclysmic event that would render him completely unrecognizable will be triggered. The progression toward Mob's explosion is rising and attempting to stop it is futile.

After foiling a world-threatening plot, Shigeo Mob Kageyama returns to tackle the more exhausting aspects of his mundane life—starting with filling out his school's nerve-racking career form. Meanwhile, he continues to assist his mentor Arataka Reigen and the office's new recruit, Katsuya Serizawa, in solving paranormal cases of their clients. While continuing his duties, Mob also works on gaining more independence in his esper and human lives, as well as trying to integrate better with the people around him. However, new supernatural and ordinary challenges test Mob’s emotional stability and force him to confront the realities around him. As he strives to continue forward on the path to maturity, Mob must resolve his emotional crises and reassess the naivety he has held on for so long.

The Monster Strike film will feature a character named Lucifer.