Lin Yuan, an ordinary modern young man, accidentally traveled to the world of the Demon Slayer Corps in the Taisho era.
The moment he opened his eyes, what he saw was a snowy field stained red with blood, and a figure he was very familiar with - Butterfly Kanae, the flower pillar of the Demon Slayer Squad, who was fighting to the death with Tōmo, the second string of the string.
In the original work, she was supposed to die on this night, leaving her sister with endless regret and sadness.
But this time, Lin Yuan stood in front of her.
On the verge of death, an unprecedented power awakened in his body - the Breath of the Sun. According to legend, it was the ultimate breathing method that combined the power of the sun and the fire of life, a realm that only Jiguoyuan had touched.
When Tongmo's frost covered everything, a scorching sun rose in the dark night.
Every use of Breath of the Sun burns life, and every redemption requires a price. The survival of Butterfly Kanae changed the trajectory of fate, but it also aroused the earlier vigilance of Ghost King Muzan. The fate of Jiuzhu was rewritten because of him, but a new crisis also followed——
Assembling on the strings, Infinite City opens in advance, and the final decisive battle is about to begin.
From a traveler alone, to a companion who knows and stays with Kanae;
From a bystander who just wants to change the tragedy, to a warrior who truly protects the world;
From the ignorance of the first awakening of the sun disk, to the final awakening of the Amaterasu form.
Along the way, he will fight side by side with the nine pillars, fight to the death with the winding string, and finally face the devil Tsuji Mukai, igniting a sun that will never fall for this world full of tragedy.
