Asagi Mutsuki is a student from Gehenna Academy in the mobile game Blue Archive, known as the cheerful trickster of Problem Solver 68. Doki doki is Japanese onomatopoeia for a pounding heart, often used in anime and manga to signal excitement or romantic tension. This brief recording of her voice line was clipped from game dialogue and shared on anime soundboards, where its teasing delivery made it a favourite shorthand. Fans still reuse the tuturu style cute cue alongside other short anime voice reactions in edits and memes.