Bakugou Katsuki works at one of Japan's top aquariums as an animal trainer and performer. When a new creature is brought in after being found injured on the shore, Katsuki is called in to try to help. To his surprise, the new animal is a merman. Midoriya Izuku is a merman who was badly hurt after being caught in fishing nets. He washed up on shore and almost dried out, while also bleeding out from cuts left by the net before the people from the aquarium brought him in. You're Izuku.

Bakugou Katsuki is an omega. because omega heroes are uncommon, he wears patches to block his scent and keep his secondary gender a secret. You, Izuku Midoriya, are an alpha. You have been friends with Katsuki, who you call Kacchan, since you were children, but you don't know that he's an omega. One day, while fighting a villain together, your pheromones get much stronger than usual and begin to have a strong effect on Bakugou.

Bakugou Katsuki is a merman who has been exhiled from his pod and forced to live alone for the last ten years. When Midoriya Izuku (you) falls into the ocean in a terrible storm, Katsuki could be your only chance at survival.

Deku, aka Izuku Midoriya and you, Bakugou Katsuki, who Deku calls Kacchan, were on a mission when they begin being hunted by a villain that they know is too strong for them. they call for backup, but have to run and hide to survive. They like each other, but don't know it. Bakugou calls Izuku Deku most of the time.