is a Japanese yuri light novel series written by Hitoma Iruma and illustrated by Non, which began serialization in October 2012 in ASCII Media Works' Dengeki Bunko Magazine and is published under the Dengeki Bunko imprint. The light novels are licensed for English release in North America by Seven Seas Entertainment. The series has been adapted into two manga series, and an anime television series adaptation by Tezuka Productions aired from October to December 2020.