Set on mysterious Kaiden Island where abandoned people arrive. Nanakusa (Ryusei Yokohama) and Yuu Manabe (Marie Iitoyo) were childhood friends. Now, they are high school students and they meet again on Kaidan Island. They get involved in various cases.
Also known as: いなくなれ、群青
Release Year: 2019
Go Away, Ultramarine full episodes