メガ！サナ・ニャン大戦！ / メタリックスチール

One summer day, Maid Gardevoir's shop has no customers at all...
The reason for this is Mascanya, who runs a very popular mobile ice cream stand (and secretly sells erotic content) nearby!
In order to win back customers from Mascanya, she evolves into Mega Gardevoir with the power of a mysterious orb and tries to remind herself of the good things about her body through sex,
but in the end, Mascanya joins in because "it's more fun if everyone does it together."
This is the story.
While this is one book in the Maid Gardevoir series, it has been written so that it can be enjoyed even if you haven't read the previous books.