Demon Slayer: a Swordsman Who Uses the Breath of the Underworld

[Single heroine Kanae, sweet girl rules the world!!!] [The protagonist is relatively older, but definitely not as big as the rock pillar. After all, the helicopter appeared too early] The protagonist Maple Xingduo, the most talented swordsman in the history of the Demon Slayer Corps, has a special kind of eyes that can see people and things in the past. As his strength increases later, this ability can also briefly see the future. He has a cold personality [but definitely better than the righteous one! He acts cleanly and has a high ability to make calm judgmentsI just don't know if I will meet Kanae again Influenced by the breath of water, he created {The Breath of Darkness} at the age of 14.