Nijiiro Sukuranburu虹色俱乐部 ; 虹色★すくらんぶる 空色★すくらんぶるス ; Niji-iro ★ Sukuranburu ; Niji-iro Sukuranburu Sora-iro Sukuranburusu ; Rainbow Scramble

A short 6 chapters span of a oneshot that is a spin-off from Scramble-b! Here are some other titles related to this series: Sorairo Sukuranburu (is the Prequel) Sotsugyou Sukuranburu (is the Sequel) Sukuranburu-b! (Adapted From) ~ ming