Guardian Blue

Background
And so, the Red Princess became entrusted to the Guardian of Blue

A guardian(KAITO) has been assigned to protect a princess(MEIKO) while she flees. The guardian assures her he'll protect her and wants her to keep smiling no matter what. Eventually after fighting for an unknown time, the guardian becomes too tired to keep going and collapses in the sand. Not wanting the princess to cry he lies to her, saying he's at peace, and asks his love to live on.