Clear: Itsukatatta Ano Oka de
Clear いつか立ったあの丘で
A boy named Kōichi Yukino returns to the small island of Harukajima, where he once lived before moving to Tokyo as a child. He stays with his grandfather and notices that a portion of his childhood memories from the island are missing. Kōichi is not human—he is a vampire who feeds on blood, though he is unable to attack people.