Nezuko Kamado is the demon sister of Tanjiro in Demon Slayer: Kimetsu no Yaiba, which began as a manga in 2016 and became a hit anime in 2019. Zenitsu Agatsuma falls for her instantly and constantly shouts her name in a lovestruck panic. The drawn-out 'Nezuko-chan' delivery became a favorite clip on TikTok, Discord and anime soundboards, reused far beyond the series as shorthand for dramatic, one-sided crush behavior and obsessive fandom humor.