Ashwood

Ashwood academy has a bit of a gruesome history. Only five years ago a student set her dorm ablaze and died, and in the eighties another had drowned herself in the river. There's a permanent chill down near the boilers, a place where the temperature should be higher, not lower. There are mysterious stains that won't go away, no matter how many times the flooring is replaced or walls are repainted, stains that have been there since at least the eighteen hundreds, possibly earlier. And Ax McNialláin, a boy who can see the many ghosts haunting the school and nearby town, is going to get to the bottom of this, no matter what it takes.

(there are characters implied to have killed themselves in the first three chapters, it's mainly passive, they don't actively harm themselves, but two of them imply a jump, please don't read those if they're triggering to you, and the deaths will be referenced in later chapters too. all the chapters are short, only a paragraph long)