What Theme Is This?

http://youtu.be/k4txmgo6r_o

Skip to 5:55.

Sounds like it's from an old anime that I know I've seen, but cannot for the life of me remember the name!

http://i.imgur.com/d3IUlTt.jpg

Eheheh, thank you. ^ ^;

AFFIRMATIVE
http://i.imgur.com/cWubaPd.jpg