The Blue-Haired Knight’s Story (translation from danbooru)
The Blue-Haired Knight was loyal to the Princess.
However, one day, the Princess was severely injured in an accident and was deprived of all that she loved.
In order to cure the depressed Princess, the Blue-Haired Knight started an adventure.
He met a mysterious fairy.
The fairy said, “I can grant you a wish, but in return, you have to fight against the demons in this world for the rest of your life.”
The Blue-Haired Knight accepted the fairy’s offer after thinking for a few days.
“Contract concluded.”
The Princess was healed by the fairy’s powers, unbeknownst to her.
The Blue-Haired Knight started to fight against monsters.
However, the Green-Haired Prince was also in love with the Princess. “I will propose to her tomorrow afternoon,” he told the Blue-Haired Knight.
“However, as you are an important friend of mine, I’ll let you have a night with the one I love.”
The Knight declined the Prince’s offer.
Painfully awaiting the dawn and the Prince’s subsequent proposal…In the end, he could not touch her.
Remorse, Jealousy, Regret, Grief—
The Knight tainted his soul—
And there he laid, and became a monster.
