Reverse Erosion

Rilan calmly interjected amidst the plethora of information Kasugano Sora had thrown out in just twenty short minutes, "So, if I understand correctly, you're saying I'll be pulled into this place called Touhou Project for an experiment, and then embark on a series of adventures across various worlds, including the one you mentioned, 'War of Touhou Project,' as well as 'A Certain Magical Index,' 'Fate/Zero,' 'Puella Magi Madoka Magica,' 'Kantai Collection,' 'Magical Girl Lyrical Nanoha,' 'Fate/kaleid liner Prisma Illya'... and various other miscellaneous worlds?"

The girl with twin-tails gently nodded, holding a rabbit plushie in her arms. "Yes."

"...So, where exactly did you know about all these things concerning me?"

The girl's gaze was somewhat evasive, but under Rilan's probing stare, she finally answered honestly, "All these things about you are known from the games. Because 'War of Touhou Project' was a huge hit, game developers obtained rights from other developers in succession, turning them into a whole series of games... Your background description and story progression are all introduced within the game setting."

Observing Riran's furrowed brows, the girl quietly added to herself, "After all, he's the protagonist of the entire game..."