Sekai de 1ban Shiawase

 is the thirty-fourth album released by Seifuku Koujo Iinkai.

Tracklist

 * 1) Koi Seishun Shoujo (恋・青春・少女; Love, youth, girl)
 * 2) Kurukuru Handkerchief
 * 3) Happy Happy Birthday
 * 4) Namida no Etude
 * 5) Kimi to Kyuukyuusha
 * 6) A.I.S,A no Theme (A.I.S,Aのテーマ)
 * 7) Datsu! Datsu! Datsu Genpatsu no Uta
 * 8) TV ni Sayonara
 * 9) Genpatsu Sae Nakereba (Hashimoto Mika with Seifuku Koujo Iinkai)
 * 10) Banzai Banzai (ばんざい　万歳; All the best)
 * 11) Choko Ageru! (チョコあげる！; I'll give you chocolate!)
 * 12) Sekai de 1ban Shiawase (世界で1番幸せ; Sekai de 1ban Shiawase)

Featured Members

 * Ogawa Anna (#1 #2 #3 #4 #5 #6 #7 #8 #10 #11)
 * Kyomoto Momoka (#2 #3 #7 #11)
 * Katori Yuka (#1 #4 #6 #8 #10)
 * Shimizu Karin (#1 #2 #3 #4 #6 #7)
 * Aizawa Misaki (#7)
 * Miyano Aisa (#1 #2 #3 #4 #5 #7 #10 #11)
 * Fujimiya Reika (#4 #7)