Demon Slayer: Kimetsu No Yaiba's Wind Proficiency, Semi-Invincible at the Beginning

Accidentally traveling through the Demon Slayer World, Kamiya Rin is ten years older than Tanjiro, and is bound to the [Proficiency System] at the beginning. Practicing swordsmanship increases proficiency, slaying ghosts increases proficiency, and practicing breathing techniques will make you semi-invincible! Breath of Wind·Whirlwind—Perfection! Breath of Wind·Instant Cut——Perfection! Breath of Wind·Fengming Tianyun—unlocked directly! While others have been practicing hard for ten years, his proficiency has improved rapidly. Ordinary ghost? One slash. Bottom string? Just seconds. Winding? Still crushing. Ghost King Wumei? In front of the absolute breath of wind, it is nothing but dust in the wind! Starting from Kirigakure Mountain, Kamiya Rin used his invincible appearance to sweep away evil spirits and protect Taisho. In this life, he wants to bring an end to the era of ghosts!