Another - Vol. 3 Ch. 13

[MangaDex]

 

[SpecialProjectY]

If the curse is strong in vicinity of the classroom and weakened by how far they are, eaving the city and never visiting it or best scenario, go overseas... I mean, this or dying in gruesome way...

Kouichi being "the dead one" is hinted. I mean, mayyybe...

Oh, Kouichi father didn't die?