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Chapter 178 of Demon Slayer: Kimetsu no Yaiba , titled is a pivotal and emotionally charged chapter that serves as the tragic conclusion to the backstory of Kokushibo (Upper Rank One) and his twin brother, Yoriichi Tsugikuni . The Envy of a Prodigy

How one twin’s affection was perceived as pity by the other, leading to a centuries-long tragedy. Chapter 178 of Demon Slayer: Kimetsu no Yaiba

Contrasting Yoriichi’s effortless grace with Michikatsu’s grueling, yet inferior, effort. who was born with a natural

Kokushibo’s physical and spiritual degradation in the pursuit of strength. Chapter 178 of Demon Slayer: Kimetsu no Yaiba

The chapter delves deep into Kokushibo’s perspective as he reflects on his life as Michikatsu Tsugikuni. Despite Michikatsu’s dedication to mastering the blade, he remained forever in the shadow of his brother, Yoriichi, who was born with a natural, god-like talent for the Sun Breathing technique [1]. This chapter explores the destructive nature of Michikatsu’s envy, which eventually led him to abandon his humanity and family to become a demon in a desperate bid to surpass his brother [2].