Other Name: The Deepest Blue; 最果てのアオ
Author: Fuyume Saya ,
Year of release: 2014
After losing his memories in a traffic accident 3 years ago, Haru is now living with Kiriyuu, his saviour and legal guardian. But after a school trip where he and his friends wander in an ancient lab, Haru discovers that there might be more to his lost memories than he thought.