Gensokyo, a hidden realm beyond our world, is only known to a select few. Maribel Hearn and Renko Usami belong to this exclusive group as the Secret Sealing Club's solitary members. Together they tirelessly research Gensokyo, uncovering mysteries ranging from the legendary Genso-Lunar War to the Moriya Shrine's beginnings. Their curiosity has no limits, whether they are engaging in casual chitchat or deep discussions, or scanning for individuals with connections to this enchanted domain. Nothing can dampen their ever-growing fascination, not even the sky itself.