Blue Drop - S01

Five years ago, Kamioki Island was the site of a horrific event-one so terrifying it wiped Mari Wakatake's memories clean while leaving every other person on the island dead. Now, forced to attend a secluded girls' school, Mari doesn't realize she's being watched, her every move monitored by unseen forces eager for her forgotten past to resurface. Deep in her mind lies the darkest truth: though Mari was the only human to survive, she might not have been the only one to walk away. As something wearing a woman's shape infiltrates Kaihou Academy, Mari's sole chance may rest with a mysterious girl she feels drawn to but can't bring herself to trust.