Himeno and the others are chosen as a preparatory committee for Jean Rousseau, a French-raised amphibian businessman who is scheduled to give a speech at their school. While visiting his homeland prior to his speech, Jean is concerned by his people's willingness to rage war against mammal-based lifeforms.

The girls participate in an RPG fantasy setting, fighting against monsters in a dungeon labyrinth, which turns out to be a story written by Mitsuyo.