- Keyboards : Seiko Nagaoka
- Strings : Pan Team
- Children's Chorus : Mizuumi
［Cast］
- Akira Ijuin : Kappei Yamaguchi
- Utako Okawa : Chieko Honda
- Mako Okawa : Sumi Shimamoto
- Mama A : Kumiko Takizawa
- Mama B : Mari Yokoo
- Shigetaka Akechi : Koichi Yamadera
- Ryusuke Kobayashi : Takeshi Kusao
- Script : Nanase Okawa
- Sound producer : Seiko Nagaoka
- Producer : Shiro Sasaki
- Assistant Producer : Naoki Nakamura
- Engineers : Hiroshi Hiranuma, Shin'ichi Usui, Motohiro Tsuji
- Assistant Engineer : Shin'ichi Ishizuka
- Recording Studio : Victor Aoyama Studio, Arcadia Studio, Freedom Studio, Sound Valley Studio
- Audio Director : Yasunori Honda
- Assistant Director : Keiko Shima
- Sound Effect : Suwara Production
- Music Production : Arcadia Studio Inc.
- Production Manage : Masahiro Hirano
- Recording Co-Ordinate : Hideki Ofuji (Reon Company)
- Jacket Illustration : Mokona Apapa
- Comic : Mick Nekoi
- Design : Atsushi Sugihara
- Special Thanks to : Mayumi Takahasi, Shin'ichiro Inoue, Osamu Ota, Shinobu Kuwahara, Yasuo Takasu, Yasuhiro Imagawa, Makoto Watanabe, Koji Yamaoka (HAM), Dr.Sato, Tomo chan, San chan, Aoni Production, Production Baobabu, Haikyo, 21 Century Fox
- Ultra Special Thanks to : CLAMP / Nanase Okawa, Mokona Apapa, Mick Nekoi, Satsuki Igarashi
- Super Ultra Special Thanks to : Every people who listen to this album
角川書店ニュータイプ100%コミックス「20面相にお願い!!」 (CLAMP 著)のドラマと歌が入ったミュージカル風アルバムです。
ヴォーカル曲は6曲入っており、他に、山口勝平さん、本多知恵子さん、 島本須美さんなどが唄っています。