One Day, Tentacles Appeared

Hanseo, an ordinary office worker, starts having a recurring dream where he's humiliated by tentacles every night. He tries psychiatric counseling and even buys expensive talismans, but nothing helps. As he withers away day by day, a man finally appears before him, claiming to know the cause of his dreams. He then tells Hanseo something shocking... "W-wait, you're telling me I'm a female?! What in the world is your species?!"