Castlemaze: Ojou-sama kara no Chousen

Reimu finds herself confronted with an unexpected letter bearing a challenge from the mysterious proprietor of the Koumakan mansion. This cryptic summons sets the stage for her to venture into the grand estate, where she must navigate its labyrinthine corridors and face whatever trials await within its walls. The nature of this challenge and the intentions behind the invitation remain shrouded in mystery as Reimu prepares to cross the mansion's threshold.