Responses
Actually it's a belief that good/bad things comes in a set of seven, hence the name.. It's only a trope and is supposed to be different for every school.. Since you mentioned hanako-kun series here: https://hanakokun.fandom.com/wiki/Seven_Mysteries
Ohhhhhhh so thats what it meant, my bad lol, thank uuuuu (⌒▽⌒)
No problem.. (●'◡'●)ﾉ
After reading jibaku shounen hanako-kun, I've been pretty interested in the japanese folklore called the 7 wonders/mysteries of the school (๑•ㅂ•)و✧ I google searched about this but couldn't find the names of the wonders ┑(￣Д ￣)┍ So far I only know the misaki stairs/ the stair game and hanako-san. Someone plz tell me what are the rest of the wonders of the school Σ(っ°Д °;)っ