Stairway to Darkness (闇へと続く地下道 Yami e to tsudzuku chikadō, Leading to Darkness underpass) is the 21st Sub-Chapter in Stories of Legend. This Chapter has Two-Star, Three-Star and Four-Star difficulty, which amplify the strength of enemies in each level.
- This chapter features 3 new enemies.
This Sub-Chapter features Six new levels.
- Stage 21-1: Safe and Not Sorry - Pigeon de Sable makes it's first appearance here as support for the boss R. Ost, who will spawn with a large group of Pigeon de Sable and a Mooth when the base has been damaged.
- Stage 21-2: Claustronyctophobia - Dark Otter will make his first appearance here as a support unit for The Face, along with Wall Doge, Gory Black, Doge Dark, and H. Nah, who will all serve as very strong support units.
- Stage 21-3: Red Alert - This level consists of all Red-Type enemies, such as Dark Emperor Nyandam, Shy Boy, St. Pigge the 2nd, and One Horn.
- Stage 21-4: Pitfalls of Life - Sunfish Jones is the main boss of this level, followed by Bores periodically through the level.
- Stage 21-5: Subtle Curfew - Angelic Sleipnir will appear in this level for the first time as the boss, and will receive back-up from many units, such as One Horn, Metal Hippoe, Dagshund, and more.
- Stage 21-6: Underground - The final level will have you battle Teacher Bun Bun, J.K Bun Bun, and Bun Bun Black at the same time, who are constantly supported by Shadow Boxer K and Gabriel.
- Red Alert is one of the only stages to feature exclusively Red-Type enemies