The transfer student Haruchan Satouki is full of mysteries! Is she male or female? No one knows even after talking to her. However, when she becomes completely naked, her plump breasts are revealed! But it might be too early to assume she's a woman just because she has a female body... In fact, there's even a possibility that she isn't human at all?! While harboring faint romantic feelings for Haruchan, why not be surprised by her true identity and the ending?
