"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.

The DVD will contain the promotional video for Hishoku no Sora.

[1] Anime News Network's Theron Martin described the "synth-pop" track, "Hishoku no Sora", as "solid" and "enthusiastic (if not entirely original-sounding)".