"Hishoku no Sora" (緋色の空, Scarlet-colored Sky) is the second single of J-pop singer Mami Kawada. The title track was used as the first intro theme to the anime Shakugan no Shana. This single peaked at the #11 spot on the Oricon charts and has sold 16,503 copies on its first week. It stayed at the Oricon weekly charts for 18 weeks and sold a total of 36,661 copies overall. The single will come in a limited CD+DVD edition (GNCA-0019) and a regular CD only edition (GNCA-0020). The DVD will contain the promotional video for Hishoku no Sora.