Silent Siren is a 4-piece all-female band formed by Suu (Sumire Yoshida as Vo & Gt.), Hinanchu (Hinako Umemura on Dr.), Ainyan (Aina Yamauchi on Ba.), and Yukarun (Yukako Kurosaka on Key.). They all have backgrounds as reader models for major magazines, though their passion towards their music is authentic. Their first single, “SWEET POP!” was released on November 2012 and since then, they have risen in popularity amongst Harajuku high schoolers, whom endearingly call them “Sai Sai” for short.