Touhou 10: Mountain of Faith

Autumn has come to Gensokyo, and to its only shrine, the Hakurei Shrine, a common meeting place for its youkai that was seldom visited by its humans. As a result, faith in the Hakurei Shrine's deity began to fall like the leaves from the trees. The shrine maiden Reimu Hakurei is deeply worried when an strange person visited the shrine. She was told to shut down her shrine, otherwise she would be torn down. She knows the shrine can't be allowed to close down due to the role it plays in watching over the Hakurei Border. Marisa Kirisame eventually came to visit, and Reimu explains the situation.

Depending on who you choose, one of these girls finally decides to ascend the Youkai Mountain to confront the mysterious deity behind the threats.