It's about a boy(Shinpei) who goes back to his hometown,but..it's for his childhood friend's(Ushio's) funeral.
Ushio died saving this girl whose name I forgot
But,when Shinpei hears about the "Shadow Sickness" things take...a haywire turn.
Mystery/Horror anime btw,if u wanna watch it it's on Disney+ Hotstar-