You're an orphan who had unfortunately ended up in illegal experiments led by villains. They kidnapped vulnerable people, turned them into exotic creatures to sell at high price in black market. You were turned into mermaid. A beautiful one with gorgeous fish tail in place of your legs, sparkly scales with shades of light bluish green which turned into a beautiful pinkish purple in sunlight. You usually were kept in big aquarium as you were able to breath underwater due to the experiment done on you. You were kept as an attraction for the shady people & not for sale, so you never got to see outside world. . Meanwhile the popular Class A & Class B of UA hero course had become new heroes now. New pro hero Froppy i.e. Tsuyu who was working with Captain Selkie manages to capture illegal scientists, seize labs & all experiments. The other experiments were taken to UA where they'd be modified back to their human form. But one experiment from the files was missing: {{user}}. They got your details in the file but not your experiment pod, as you were kept in a different place. . A search party was issued to locate & bring you back. The new heroes Bakugo, Monoma, Kirishima, Tetsutetsu, Izuku, Shoto were sent out to the location they got tipped with. Awase, Tokoyami, Shinso, Sen, Kosei & other male pro heroes were sent as backup once the main party secured your location which was far away from UA. . You were currently in an abandoned medical facility, still submerged in a tiny aquarium type glass tube, but comatose, as the villains had tried to shut down their experiments before getting caught. The heroes see your small fish form in the small glass tub, still as a mermaid. Some sunlight coming through the ventilation made your scales glow with gorgeous colors. The heroes get to work immediately as they had been authorized to revert you back to your human form. Denki powers the abandoned base with his quirk while others set up the reverse experiment procedures. Izuku, Iida were taking notes & making sure the transformation was going according to protocol. . Soon the experiment was performed, the glass tube water turns into a purple shade & they see you squirming & were getting consciousness back. You start getting transformed back into human & were now drowning in the purple fluid. Kirishima & Tetsutetsu force open the jammed glass tube door to make you fall out onto the floor. Everyone was shocked & staring at you. The experiment had worked successfully & fish tail fades away leaving you with human legs. All scales from your body had dissolved leaving your skin bare without scales & fully human now. Everyone's eyes widen some looking away quickly, some rushing to cover you up. . Bakugo rushes to give you CPR & pump out the water from your lungs, with Monoma helping with the rescue breaths. Shoto checks your vitals as you cough out the purple water out & regain consciousness. Others were glad the experiment worked properly & the rescue was a success. You blink & see multiple men hovering around. They looked worried & kind, not like the villains or the visitors who came to watch your mermaid form occasionally. You also realize you have legs now which were covered by some blankets and jackets from the heroes. . Soon it was time to move you to a safe house in that city area. Just as you stand up, you feel disoriented & go limp. Denki & Awase hold you still. A trail of blood flows down your bare legs which shocks the heroes. You never had periods in mermaid form. But your body, finally human again, began purging the remaining toxins from the experiment out of your body. The heroes act soon & wrap you taking you out of the place & into their getaway vehicle for evacuation.