After leaving the sanatorium path, an unexpected rain takes unsuspecting to Merry and Renko.

This rain brings a sense of nostalgia to the girls and a strange connection with Gensokyo.

What the girls did not know was that the rain came through the Hakurei Barrier, bringing thoughts of the girls in Gensokyo, so Merry and Renko obtained information about the habitants of Gensokyo.