Mermaids

Boku No Hero Academia x Male Reader
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Mermans and Merwomen hate humans
Humans hate them as well since they
are scared of them
(M/n) is a human who lives alone in a big house, he has no mother nor father he just a young teen living alone with a great fortune left by his mother. While walking he heard something strange in his backyard? What impact will this cost to the world?
Or much better to say how will his life be affected?