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Ruka.
I'm sorry you exist.
I hold you in my arms as your demon father writes this for you. I'm doing my best to treasure you while I still have you.
By the time Akaza delivers you at Koucho's, we'll most likely be dead by the Demon King's hand. If not him, then I alone.
If not dead, then I may have been turned to a demon and forced to leave my humanity behind. It pains me greatly as I won't be there for you. With the organs forced on me I nurtured you in my body and gave birth with only your demon parent by my side to aid me. Why me? I'm sorry kyojuro.
The Demon King planned to eat you, you being a hybrid and possibly the one to conquer the sun. I couldn't allow that. Akaza couldn't. Akaza loves you so much. Can you believe demons still have enough humanity in them to love? Or maybe I'm deluding myself and clinging on to the fact he never eats girls to begin with. I do love you Ruka.
I wish things were different. I wish you were human. I wish you had been born from a woman I'd marry instead of my own dying body.
I wish I had never become a demon slayer at all if it meant being with you. I'm allowed to be selfish in my dying moments aren't I?
I love you. More than you will ever know.
- Kyojuro Rengoku