My Intimate Love with the Devil King

I grew up in a fairly well-to-do and close-knit family. And I always thought life was going to be great.
Until the accident happened...
"I felt pain and utter hopelessness. I couldn't breathe, my heart was being torn apart, I didn't want to hear anything..."
"Nothing else mattered." The accident took the lives of my loved ones and put a cross on my future. My eyes were badly damaged and the whole world became blurry. I didn't understand why I should go on living. But I met you. You saved me and became a ray of light that carried me along.So began my life with Flan, the Monster Queen of the Otherworld. We got to know each other and experienced an adventure together that I never dreamed of. But the more I tried to understand her, the more I felt that she suffered as much as I did. She, too, had been abandoned. The burden of leadership, the distrust of the people, and the constant threat to life were all things that one person could not bear. Flan, this time it's my turn to save you.