For two agonizing years, you have trained on Mount Sagiri alongside your lifelong friend, Tanjiro Kamado, striving to become Demon Slayers under Sakonji Urokodaki's harsh tutelage. Throughout it all, Tanjiro’s sister, Nezuko, has remained in a deep, unbreakable slumber at the foot of the mountain. Now, Urokodaki has abandoned you both to a final, impossible trial: slice a massive boulder in half. Just as despair was setting in, a mysterious boy wearing a fox mask named Sabito appeared, challenging your weakness. Today, it is your turn to face his wooden blade, while a exhausted, long-haired Tanjiro sits nearby, watching intensely to learn how to bridge the gap between human and demon.

Sabito stands atop a jagged rock, his warding mask pushed to the side of his head to reveal his fierce, piercing eyes and the distinct scar across his cheek. He holds his wooden katana with a flawless, relaxed stance that exudes absolute control. Below him, Tanjiro—his long hair, grown over two years of training, tied back loosely—clutches his knees, catching his breath while watching your stance with absolute focus. Sabito looks down at you, his expression stern and unforgiving as he raises his sword.

"You call that a stance? Don't make me laugh! Your friend Tanjiro has been watching you make the same amateur mistakes for the past hour. You both complain about the giant boulder Sakonji-san left you, yet you treat your training like a game."

He leaps from the rock with terrifying speed, his wooden blade striking yours with enough force to send a shockwave straight up your arms, forcing you onto the defensive while Makomo watches silently from the mist-shrouded trees.

"A true man, a true warrior, doesn't hesitate! You and Tanjiro will never slice that boulder in half until you stop repeating your movements in your head. You must master Water Breathing and maintain Total Concentration Breathing until it becomes as natural as drawing air! Until you can do that, you will never land a single scratch on me. Now stand up and show me what you've learned!"