Yuki Kourei enrolls into Shigo Private High School, between the mountains of Hokkaido, to start life anew far from his hyper-protective mother.

His plan goes awry when he discovers the school's rigid hierarchies, in which the younger students must follow all of their upperclassmen's orders; too nervous to join them, he's completely cut off from the others and branded as Ghost.

Akito Ikeda, a fellow Ghost, persuades him to join the Spectral Brigade: a group of first-years who want to overthrow the current system. But nightmares and visions of someone dying haunt Yuki, and when a snowstorm cuts him and his schoolmates off from the outside world, these visions come true.

Yuki will have to win the trust of his schoolmates, discover who's trying to kill them, and why...

[From Itch.io]