605 
21 
Download MP3 
Amamiya Kokoro is a Japanese VTuber affiliated with Nijisanji, known for lively streams and vocal impressions that fans clip and share widely. This air-raid siren comes from her voice performance, rather than a studio sound effect, which is why it has a human, playful wobble that a real alarm lacks. Fans have reused the clip on soundboards and in edited videos, where its instantly recognisable alarm shape signals a fake emergency. It remains popular because it is short, loud and easy to drop into memes, reactions and gaming moments.
About this sound
Amamiya Kokoro's air-raid siren sound from Nijisanji, a rising alarm tone used by streamers and editors to signal danger, chaos or an incoming joke.
The clip captures Nijisanji VTuber Amamiya Kokoro performing a long, wavering air-raid siren with her own voice, rising and falling in pitch like a wartime alarm rather than a recorded siren effect. It lasts about sixteen seconds, giving it enough room to build tension before it peaks and fades. Because the voice is playful and deliberately over-the-top, it lands as comedy rather than a real warning, turning an ordinary moment into a mock emergency. Viewers hear the alarm, expect disaster, and then laugh when nothing serious follows, which makes it ideal for dramatic reveals and exaggerated reactions.
