Go Away, Ultramarine

Other name: いなくなれ、群青

Synopsis:

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