A light novel series by Iruma Hitoma (入間人間) that centers around the friendship between two high-school girls, Adachi and Shimamura. The story outlines their everyday events and contains mild yuri themes. It began as a series in Vol. 28 of 電撃文庫MAGAZINE (Dengeki Bunko Magazine) in March 2013. Since then, ten volumes have been published by ASCII Media Works with Non (のん) as the illustrator.
There are two manga adaptions; a 3 volume 2013 one illustrated by Mani, which was serialized online via Square Enix's Gangan Online website, and the other, an ongoing adaptation that began in 2019 with illustrations by Yuzuhara moke. There is also a 12 episode anime adaption by Tezuka Productions which aired Fall of 2020.
