All songs of back number
- Akai Hanabi
- Akarui Yoru ni
- Ame to Boku no Hanashi
- ARTIST
- Aru Mirai yori Ai wo Komete [Sincerely, from a Future]
- Atarashii Koibitotachi ni [to new lovers]
- Blue Amber
- Christmas Song
- Dai Fuseikai
- Emerald
- Exhibition Deathmatch
- fish
- Fuyu to Haru [Winter And Spring]
- Golden Hour
- Hanataba
- HAPPY BIRTHDAY
- Happy End
- Hero Suit
- Himitsu no Kiss
- I Love You
- Jaguar
- Joou no Saru
- Justice in the Box
- Kaijuu no Size [Size of the Kaiju]
- Kaitou [Phantom thief]
- Katte ni Olympic [Self-Olympic]
- Kiiro [Yellow]
- Kyoukasho [Kyoukasyo]
- Loneliness
- Mabataki
- Maku ga Agaru [The Unveiling]
- monaural fantasy
- Old Fashion
- Rakuen no Chizu [Map of Paradise]
- reunion
- Saishinbu
- Silent Journey in Tokyo
- Soine Chance wa Totsuzen ni
- Suiheisen [Horizon]
- Summer Wonderland
- Takane no Hanako-san
- Tegami
- Velvet no Uta