Sekai Oni x Mob Psycho 100 is a crossover chapter of the Mob Psycho 100 manga series with the Sekai Oni manga series. This booklet was given as a bonus during the "Thanksgiving Campaign" by Ura Sunday when certain books were bought.

Do you or someone you know need an exorcist who works cheap? Reigen's your guy! What's his secret to busting ghosts while keeping prices low? Well, first, he's a fraud, and second, he pays the guy who's got the real psychic power—his student assistant Shigeo—less than minimum wage. Shigeo is an awkward but kind boy whose urge to help others and get along with them is bound up with the mental safety locks he's placed on his own emotions. Reigen knows he needs to exploit Shigeo to stay in business, yet for better or worse he's also his mentor and counselor. And he also knows whenever the normally repressed kid's emotions reach level 100, it may unleash more psychic energy than either of them can handle!
 
(Source: Dark Horse)
 
Note: Includes 12 extra chapters.

A little girl called Shinonome Azma is abused by her family, and that made her quite unstable, to the point were she has been driven to the limit, and now she has the rare sickness of Alice through the looking glass, that makes her see things that shouldn't be there reflected on mirrors, water, glass, etc. Everything starts when the things she sees start affecting directly the world everyone else sees, and the barrier between reality and illusion breaks apart, like a mirror falling to the ground.

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