それはただの気分さ (romanized: Sore wa Tada no Kibun sa, English: It's Just a Feeling) is a song by Japanese rock group Fishmans, written by Shinji Sato. It was recorded sometime in 1997, around the time the band's seventh studio album 宇宙 日本 世田谷 was recorded, and was originally meant to be a song for J-pop group SMAP. It appeared on the latter's album SMAP 011 ス released in the same year. It's assumed the song was originally discarded from the album. A complete demo of the song was released on Aloha Polydor in 1999. More notably, an 18-minute long version of the track was performed live on Space Shower TV on January 11, 1998 @Space Shower TV. A studio recording of the song was never physically distributed until after Sato's death.
