Mebachi

* Based on a rhythm video game developed by Rayark. Alone in a castle, a mysterious figure plays a piano... Deemo. One day, a little girl falls from the sky. A castle littered with mysterious inhabitants, a sacred tree growing by the melody of piano, a girl with no memory, and Deemo. A gentle story that will touch your heart. Source: Official website

A war manga based on the Himeyuri student corps in Okinawa during World War II. The story revolves around San, who is mobilized to join the student corps, and her classmates and best friend Mayu as they survive the war source: ja.wikipedia.org\googletranslate