Miyari Nemoto

High schooler Ruri Tanigawa loves shiny things. She loves them so much that she heads into the mountains to search for crystals herself—where she unexpectedly meets Nagi Arato, a graduate student studying mineralogy. As the pair start collecting minerals together, Ruri begins developing a genuine appreciation for science and the beauty of the natural world.

Deep in the mountains in the middle of nowhere lives a group of kunoichi called Akane Class. These kunoichi work hard together to improve their own skills, and they all live by an unbreakable rule: “Contact with men is strictly forbidden.” But everything takes an unexpected turn when Tsubaki, leader of one of the groups, starts experiencing strange feelings whenever the subject of men comes up.