Could you tell a newbie like me about Dies Irae ? Was it well received in Japan, were people waiting for it in the west ? Also please tell me what it up with that Spinne guy ?!

Dies irae is a highly acclaimed battle opera chuunige featuring several former Nazis that gained immortality through dark occultic rites, and a young man finding out the truth about himself. Spinne is one of the LDO members and I just like him a lot even though he's kind of their weakest guy.