The band's fourth mini-album, released at lives and select stores under Soleil-successor inner dream group, after the former label closed. Some (all?) of the songs were originally planned for a release called Giniro no Sora (銀色の空), which was cancelled due to the closure of Soleil. The original release date was planned for 2002-02-22, but was postponed until October 2002.
The title, 37℃, is pronounced “Binetsu” (“微熱”, meaning “slight fever”).