Slaying demons requires total concentration at all times, which means bringing brain fog and eye crusties along for the ride is not an option. Fortunately, ABYstyle has developed the perfect weapon to ward off that morning grogginess. With a design featuring Tanjiro ready to draw his sword on one side and the warding mask made for him by Urokodaki on the other side, it's an essential tool in any Demon Slayer's arsenal, just add caffeine.