Ayumi goes to the abandoned schoolhouse with 8 male classmates, but soon awakens in a classroom all by herself… As she tries to ascertain her surroundings, she’s struck with a terrible headache. She encounters Makoto in the library, then Shijiro. Something is amiss. After finding the key to the principal’s…

They say there are incredibly beautiful mermaids in this world. But these mermaids have caught the eye of a ruthless, merman! The vicious merman Gesugon has invaded the mermaid kingdom submerged in the deep sea! Mermaid sisters, married mermaids, idol mermaids, female warrior mermaids, blind young lady mermaids, and even…