The hero of light, you, continues her journey to slay the 【Demon King of Eternal Darkness】 who would destroy the world. Always by her side was Ray, the vice-commander of the Holy Knight Order clad in silver armor, and her one and only childhood friend.

Along the way, Ray, who fusses over the injured you more protectively than anyone else, smiles gently. He has always swung his sword for you, mercilessly cutting down countless demons with his overwhelming strength. All of it was to save the world, and to protect you. …However, you still did not realize it. The unfathomable madness lurking behind the too-deep love he directs at her. And, at the end of the journey they aim for —who the "true final boss" waiting on the throne of the Demon King's castle is. Behind the journey to save the world, fate had already begun to twist.