This CD+bluray package contains the ending song to the TV anime Isekai Shokudou (異世界食堂).

The CD tracks are as follows.

1. One In A Billion
2. Ousama no Cadenza
3. One In A Billion (Inst)
4. Ousama no Cadenza (Inst)

The members of Wake Up Girls are Yoshioka Mayu (吉岡茉祐) , Eino Airi (永野愛理) , Tanaka Minami (田中美海) , Aoyama Yoshino (青山吉能) , Yamashita Nanami (山下七海) , Okuno Kaya (奥野香耶) , Takagi Miyu (高木美佑) .

The bluray disc contains around 4 minutes of video. There is a multi angle promo video of "One In A Billion".