Generation of Chaos Next: Chikai no Pendant (2002)

Ellile is a knight-in-training in the Kingdom of Fredbarn in the Neverland World. He and Princess Roji are secretly in love, and plan to marry. Lifile, the head of the knights, finds out, and tells Ellile that he's not strong enough to protect Roji, let alone the Kingdom. Ellile becomes frustrated, and contemplates what to do.