For me this is a hidden gem. After reading trough the other comments / reviews it feals like most of their problem was with the genre and not the actual novel. There no over the top fight scenes and it more about mistery and mental healt.
But don't start it since this site seems to have dropped it and the only translation I found the characthers referd to the male MC as 'she', soo the grammar was really off.(no he doesn't indentify as a female and its purely a grammatical error)