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