Demon Slayer: Tanjiro Can Always Hear My Last Words

[Demon Slayer fanfic + two male protagonists + slow redemption + making up for regrets + group portrait + HE] Mochizuki River traveled through the Demon Slayer World for three years and gained the ability to hear the last words of the deceased. As long as the deceased's last wish is fulfilled, he can borrow the power left by the other party. Relying on this ability, he saved people who should have died, changed tragedies again and again, and tried to win a dawn without regrets for everyone. But he soon discovered that every time he changed an important death, he would lose one of his most precious memories. At first, he just forgot the taste of a dish. Later, he forgot why he held the knife, the people he had saved, and even the red-haired boy who was always chasing behind him and refused to let him die alone. While everyone was celebrating that the future had been changed, only Tanjiro could smell that the smell on Mochizuki River was disappearing little by little. So, he wrote everything the two of them had experienced into a manual, and told the person who gradually forgot him over and over again: "It doesn't matter." "If you forget once, I will get to know you again." Later, everyone remembered how dawn came. But no one remembers that there was once a young man named Mochizuki River who, for that dawn, forgot the reason why he wanted to live the most. Except Tanjiro. Because this time, he will never let Mochizuki River go to the end alone.