I kinda expected Flandre to be like this she can kill anyone in the mansion if it made her excited and if she had a excuse. complete opposite of what most fancannon sees her. and the story is moving to touhou 7 thats great.
Really good chapter. he basically survived agains a creature one level above a demon lord, and worried if his daughter would survive agains it.
So it's safe to assume he would be a S rank if he wasn't unlucky in the beggining of his journey