This is hardly comparable to Mieruko-chan, which is much more shonen, quirky and fun. If anything, you could map this on a triangle diagram with Mieruko-chan and Mob 100 like this: Mob 100 in the corner funny and serious coming-of-age topics, Mieruko-chan in the corner of funny and horror, Prey in the corner of horror and serious coming of age topics.
The monsters in Prey translate 1:1 to mental illnesses and teenager's fears and anxieties. Here is just a short list of all the similarities
* the MC being singled out and sent to a mental institution cause she sees ghost
* the blonde call calling her out for it and saying she just did it for attention
* the MC having constantly slightly red eyes and strongly red eyes when she has an episode
* the MC's coping mechanism of classical music (which seems to attract a bigger/more powerful ghost that devours the smaller ghost)
* the whole theme of 'if you give in to your fear or acknowledge them, they will hurt you' and 'if you gain hope/are completely distracted, they can't'
* all of the stuff about self harm to make it stop, i.e. cutting, and suicide when the MC can't take it anymore
* the whole contagious, but also latent theme of seeing ghosts translating to higher likeliness of mental illnesses if your parents/family had them or if you are in an enviroment that facilitates such a development
* the whole theme of the MC not wanting help, cause she can manage on her own, but still looking out for the blonde girl, cause she knows when an episode happens to her
* the whole theme of the blonde girl not fully acknowledging the existence of ghosts and denying her episodes
* the whole theme of ghosts being much more personalized and hunting their prey i.e. ghost boy/long boy hunting the MC, eyestalk ghost being attached to the teacher, face-out-of-mouth woman stalking Minji, beetle-ghosts hunting one-eyed boy, long-neck-many-baby ghost observing some child through the 2nd stock window
