Jimi na Kensei wa Sore Demo Saikyou desu

The Simple-Looking Sword Saint is Nevertheless the Strongest, The World's Least Interesting Master Swordsman, 수수한 검성은 그래도 최강입니다, 即使是不起眼劍聖亦是最強, 地味な剣聖はそれでも最強です