I've Just Been Discharged from the Hospital, You Said It's the End of the World? !

[Mythical elements + city + doomsday + game + urban martial arts + immortality + imagination + Cthulhu] Have you ever thought that all you see is what others let you see? Have you ever thought that what you experience is just someone else's careful arrangement? After a twelve-year-old boy saw a hallucination one day, he firmly believed that the hallucination he saw was real and the world he lived in was fake... …… (No routines, no heroine, not invincible, not brainless, unconventional and cool, if there are pitfalls, you must fill them in)