Valkyrie Drive: Mermaid

Tokonome Mamori is sent to Mermaid, an artificial island designed to quarantine people with superhuman abilities. After being attacked, she’s rescued by a new transfer student named Mirei. But their enemies keep coming, leaving the two trapped and outmatched. Just as they’re about to give up, Mirei kisses Mamori-and in a flash, Mamori transforms into a sword. Gripping the blade, Mirei fights back against their assailants.