Chronological Play Order
Two hard unlock gates shape the progression order: the first playthrough always resolves to フィーナ, and the final two routes only open after clearing every other heroine in your edition. Following the sequence below preserves narrative pacing while minimizing repeated common-route reading.
Stage 1: Mandatory Opening Route
Stage 2: Standard Heroines (Any Order)
From your second playthrough onward, you can clear these routes in any order. Playing Earth-side heroines before Sphere-side heroines keeps mystery reveals gradual.