Hortensia Saga: Ao no Kishidan (Japanese: オルタンシア・サーガ -蒼の騎士団-, Hepburn: Orutanshia Sāga: Ao no Kishidan) is a Japanese free-to-play role-playing video game developed and published by f4Samurai and Sega. It was released in Japan in April 2015 for Android and iOS devices. An anime television series adaptation by Liden Films aired from January to March 2021.