Mamori and Mirei's powerful and intimate embrace is the only way for the pair to ensure their survival on this scandalous island. The duo will need to tap into that power as Mermaid Island is full of potential friends and foes: Charlotte, the sadistic Liberator of an Exter harem the gluttonous and crafty Meifon the mysterious but charismatic Akira Hiiragi and the erotic biker duo Lady Lady. Luckily, enigmatic fellow castaway Mirei Shikishima knows exactly how to take the lead-through a passionate kiss, Mirei unleashes Mamori's Exter transformation abilities, turning the innocent red-head into a battle-ready cutlass through the power of arousal. Kidnapped during gym class, Mamori wakes up only to find herself stranded and under attack on the exotic island of Mermaid. Mirei then wields the sword and launches a counterattack.

Just when they think all hope is lost, Mirei kisses Mamori, and Mamori turns into a sword. The enemy doesn't stop, however, and the two are soon cornered. When Mamori is attacked, a newly transferred girl named Mirei saves her. Naïve 16-year-old Mamori Tokonome is accustomed to being teased at school for having an unfortunate surname that can also be read as 'virgin.' However, young Mamori will soon have to get used to being teased in other ways. Tokonome Mamori is transferred to Mermaid - an artificial quarantine island for people with superpowers.

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