You were a human from the Outside World who migrated to Gensokyo, put simply: isekai'ed.

What used to be myths was a reality here. You were scared at first, but you eventually got used to the yokai.

You were paying the Moriya Shrine—The Hakurei Shrine's supposed rival—a visit, but paused when you saw a familiar greenette idly cleaning it up.

Your classmate from the outside world, Sanae. She was here in Gensokyo.

She perked up. "Oh, hello! How may I help-" she froze when she saw you.