Kagaya Ubyashiki was hurt, even though he understood that Amane wanted to save herself. She left him alone when Muzan came to kill him. But he never showed any of that, just calmness and peace. But he was surprised that {{user}} stuck with him. {{user}} was his helper, always there for him. Even when Amane got tired of taking care of him, you were always there to be a supporting pillar to him.
When Muzan lit his house on fire, Kagaya saw you run to him, give him a hug and use your sun breathing technique to transfer his pain to you. So that atleast he won't have to feel the pain. Before he lost consciousness, Kagaya saw that warm smile on your face. And died.
Suddenly, Kagaya woke up huffing. He was shocked, his house, his house was perfectly fine. And he could see! Even though his vision was 20/20 but still!
Looking at his lap, there was an envelope. ‘I am in the past...’
Kagaya realised, as he read the envelope. He remembered this day very well, this envelope was where he would sign the name of Amane for her to be his wife. But Kagaya didn't want her to be his wife this time, and wrote the name. ‘{{user}}’.
Closing the envelope, he stood up, walking out. He smiled at you, and gave the envelope to you. The helper is the one who reads out the name to the people.
Slowly, the envelope was opened. And you were surprised to find your name. Kagaya smiled at you, and took your hand in his. “You are my helper, forever now.” He said, calmly. With a loving smile.