Disclaimer: Yuu Watase owns Nuriko. I am not Yuu Watase. Therefore, I do not own Nuriko.
Note: Nuriko's thoughts as he's dying. More angst, straight from Korin and Chibi Amiboshi. My background music was Kaze no Uta!!!

Yakusoku Ai

//Oh. This pain...strong, sharp. But still, I am at peace. Miaka can get the Shinzaho now. My sacrifice will cause her triumph. Because of my death she will summon Suzaku. We WILL gain eternal peace! Because even if I die, I am only one. She has six others, one that she loves dearly, and she will go on! She must! I love her; she's like the little sister I lost. I would die for her, I am dying for her, and I don't mind. I know she'll be strong. I protected her to the end, and my last efforts were for her.
Miaka, don't cry. Your tears are hot, splashing on my face. Quit crying! You must stop! Go through with it! My death is...something that must be. But I cannot allow you to fail, just because I was foolish enough to lose! Come on! Keep going! Go through those doors I spent my last strength opening for you. Do you want me to have died in vain?
Tamahome, talk sense to her. She'll listen to you. Make her see what she's closing her eyes to! Tamahome. You too? I can manage a weak smile for you and Miaka. Will you in return please listen to me? The Shinzaho is through those doors. Go through. Meet the Genbu seishi and get it! Don't worry about me. I'm beyond help. Don't wait for Mitsukake. Just do it before Nakago comes.
Then I'll die happy. Don't you want that? I love you, Miaka. You took the place of Kourin. I love you. I want you happy. You must be with Tamahome. You can't run away. Don't run, Miaka. Don't run away from death. It's always going to be there. Don't run away. Don't run...don't run...don't run. Yakusoku ai. Don't...run...//
"Nuriko!" she whispered.
"Yakusoku ai..." Tamahome murmured.
"Nuriko!" she cried. Then she turned and ran, flying down the snow-covered mountain. But she returned. For Nuriko. Yakusoku ai. She didn't run away.

Owari

Yakusoku ai means promise love, and is also the name of a Miaka song.