When she was young, Nanami was rescued by a righteous hero. Nanami longed to be a hero, and she wanted to be on the side of justice herself and protect the weak, so she continued her bloody efforts and became a Charge Mermaid. A charged mermaid who fights valiantly to protect justice. When the Mermaid encounters her companion Charge Pegasus being chased by the Phantom, she does not know that it is the Pegasus' plan and confronts the Phantom alone to save the Pegasus. A mermaid who is attacked by a phantom and takes damage. Pegasus and the others hurriedly change their strategy and try to defeat the monster, but the mermaid is used as a shield and cannot attack, and the phantom is missed. The chargemen, who have reached the limit of their patience with Nanami, who continues to make such failures many times, finally notify Nanami that they are out of power. Again, Nanami tries to destroy the evil organization alone in order to become a Charge Mermaid, but now that Nanami cannot transform, she cannot defeat the monster and becomes a captive. The evil organization takes Nanami hostage and blackmails the Chargeman. What is the fate of Aoi Nanami ...?! ［BAD END］