Kotomine Kirei is the priest and main antagonist in Fate/stay night, first released as a visual novel in 2004 and later adapted into popular anime series. His line to protagonist Shirou Emiya, Yorokobe shounen, meaning rejoice boy, became one of his most quoted moments because it sums up his manipulative personality. Clips of the delivery spread through anime forums, YouTube edits and soundboards, turning a serious story scene into a shorthand reaction for smug villains, fake blessings and ominously good news among fans.
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Kotomine Kirei saying Yorokobe Shounen from Fate stay night, the iconic rejoice boy line anime fans use for smug, ominous reaction moments online.
This short clip captures Kotomine Kirei delivering his famous line Yorokobe, shounen in a calm, deep and quietly menacing voice. There is no music or background noise, just his slow, deliberate delivery that makes a simple greeting sound like a threat. The contrast between the celebratory meaning, rejoice, and his smug tone creates an unsettling feeling that something terrible is about to happen. Listeners familiar with Fate recognise it instantly, while others still feel the mocking, villainous energy that makes the moment so memorable and unsettling in any context it appears.