Demon Slayer: I, the Swordsmith, Rely on the Hammer of the Sun to Protect the Flowers.

Traveling through the world of demon slaying, Tetsunokura Kai starts as a low-level swordsmith apprentice, activates the forging system, and gets bonuses when the hammer is struck, and can also unlock hidden skills. When he repaired the broken knife of Hanashira, he accidentally unlocked the Breath of the Sun. His superb skills and special abilities impressed Butterfly Kanae, and even actively pursued him to ask for a knife. He used the breath of the sun as a guide and blood as a medium to forge the strongest sun flame blade, protecting the flower column from death. In the intertwining of the knife and fire, the two became more and more in love, and their counterattack became a legend!