31Wonderland

 is the second album by Silent Siren. It was released on February 12, 2014, and peaked at #4 on the Oricon albums chart.

Regulard/Limited Edition CD

 * 1) 31Entrance
 * 2) Ring Ring Ring
 * 3) Biisan (ビーサン)
 * 4) 「Are you Ready?」
 * 5) LOVE FIGHTER!
 * 6) Antinomy (アンチノミー)
 * 7) Delay
 * I×U
 * 1) Limited
 * 2) Milestone (マイルストーン)
 * 3) Amerfuri Frill (雨降りフリル)
 * 4) Guruguru Wonderland (ぐるぐるワンダーランド)

Limited Edition DVD

 * 1) Bisan (ビーサン) (Music Video)
 * 2) I×U (Music Video)
 * 3) Guruguru Wonderland (ぐるぐるワンダーランド) (Music Video)
 * 4) Silent Siren Document「First Birhday」 (documentary)