Otonagai. (おとな買い。, lit. "Buying a Large Amount of Collectibles") is the first album by Japanese hard rock band Rider Chips, released on March 16, 2005. The catalogue code for this album is AVCA-22283.
- "ELEMENTS" feat. Ricky
- "The people with no name" feat. m.c.A.T
- "Sitting On The Dynamite" feat. Jin Hashimoto
- "We gotta fight" feat. Diamond Yukai
- "DEEP BREATH" feat. Rolly
- "Neppū Rider" (熱風ライダー, Neppū Raidā, "Hot Blasted Rider") feat. Ricky
- "Gravitation" feat. Keiko Terada
- "Kaban" (鞄, Bag) feat. Kenji Ohtsuki
- "Kamen Rider no Uta" (仮面ライダーのうた, Kamen Raidā no Uta, "Song of the Kamen Rider") feat. m.c.A.T
- "Super Human" feat. Ricky
- "Hard knock life" feat. Diamond Yukai
- "Hateshinai Honō no Naka e" (果てしない炎の中へ, "To An Endless Flame") feat. Keiko Terada
- "Touch" feat. Rolly & Jin Hashimoto
- "The Last Card" feat. m.c.A.T
- "POWER CHILD" feat. Rolly
- Yoshio Nomura – guitar
- Koichi Terasawa – bass
- Joe – drums
- Ayumu Koshikawa (violin) – track 8
- Cher Watanabe (keyboards) – tracks 1-4, 6-12 & 14
- Diamond☆Yukai (vocals and blues harp) – tracks 4 & 11
- Jin Hashimoto (vocals) – tracks 3 & 13
- Keiko Terada (vocals) – tracks 7 & 12
- Kenji Otsuki (vocals) – track 8
- m.c.A・T (vocals) – tracks 2, 9 & 14
- Muneyuki Kamimoto (keyboards) – track 15
- Raida (chorus) – Shounen Shoujo Gassyoutai
- Ricky (vocals) – tracks 1, 6 & 10
- Rolly (vocals) – tracks 5, 13 & 15
- Yoshichika Inomata (keyboards) – tracks 5 & 13
