Calendula Requiem. The OP2 of anime SHIKI.
NO NOT THIS SHIKI
BUT THIS SHIKI.
SHIKI is also known as Corpse Demon by the way. I wont give you any hints unless you watch the anime or read the manga by yourself :D
Please do read it. No skipping chapters and reading synopsis on Wikipedia. It will make the series less interesting. It will start off a little dull, and suddenly becomes kickass.
Do enjoy >:D
