Ayanokoji is best known as Kiyotaka Ayanokoji from Classroom of the Elite, while senpai is the Japanese honorific for an older schoolmate or mentor. Clips built around short senpai lines circulate widely on soundboards and in anime edits, alongside other cute voice moments like Tuturu. The phrase became useful less as a quote to identify and more as a reusable reaction, shared for streams, Discord calls and short videos whenever someone wants a sweet, exaggerated anime-style goodbye without needing any context from a full episode or scene.