Sunken Fossil World/Flandre Scarlet (A)

Note: Flandre's routes are a bit unique compared to the others. The playable characters all head to the Underworld, save for Yuuma who already lives in Hell. Meanwhile, Flandre is at the Scarlet Devil Mansion, her home, where Okina greets her and uses her powers to generate three doors for Flandre to walk through. Each of these doors sends her to a different enemy, explaining the split between Routes A, B and C. Therefore, unlike other routes, only the introduction cutscene is named, and its chapter is called The Secret God and the Destructive God's Long Day. For the sake of clarity, the format here will be Stage # - Location.

"Now, pick any door you please! – That door leads to a modest opponent. You can challenge them by climbing up in front of the door. It might not be enough to satisfy you though."

- Okina Matara

Stage 1 — Forest of Magic
Versus Marisa Kirisame

Stage 2 — Earth Spirit Rainbow Cave
Versus Kogasa Tatara

Stage 3 — Underground Fusion Reactor
Versus Kanako Yasaka

Stage 4 — Former Blazing Hell
Versus Utsuho Reiuji

Stage 5 — Sea of Petroleum
Versus Yuuma Toutetsu