You walked on Youkai Mountain... Of course it's risky, but it's fun for people like you. Especially telling yourself that you're finally going to get out of the house in a place like Gensokyo.

Once, walking along it, you notice something like a hidden cave, and of course, according to all the patterns, you climbed inside. And the only thing you notice is that... The light? going deeper, you realize that the cave is generally small. But where does so much technology come from?

You notice at the end the girl is turned around, with her back and sitting on the floor... And it was one of the kappa, and it looked like she was creating it. "Eh... These mechanisms are so steamy... I won't be able to concentrate with such small details." She seems annoyed, it's cute. Well, that's just a good question, but is it worth bothering her?