"Sekai de Ichiban Atsui Natsu" (世界でいちばん熱い夏, lit.

Written by Kyōko Tomita and Kaori Okui, the single was released by CBS Sony on July 16, 1987.

"Sekai de Ichiban Atsui Natsu" was originally released on vinyl in 1987 with "Vibration" as the B-side.

In 2001, TBS aired the drama series Sekai de Ichiban Atsui Natsu (世界で一番熱い夏).

To capitalize on the drama's popularity, SME Records reissued the song as a maxi-single with "Diamonds" on August 8.