Four suns that brought blessings to the world. One of them vanished, and people grieved and mourned. Nia, a sky explorer who adventures through the skies, and Mano, an automaton, headed to the Tower in the Mist, the place where the sun was said to have fallen, for investigation. However, they were caught in a storm, and their airship malfunctioned. They decided to repair their airship inside the tower while searching for the sun.

"Alright then, I'll go investigate right away!"

However, the interior of the tower was an abnormal space, a complex labyrinth infested with numerous monsters. Furthermore, ghosts even appeared, and Nia was captured. The young girl who controls ghosts, Mary. She seems carefree in some ways, but it appears she absolutely won't forgive intruders into the tower...

A brown-skinned, energetic girl raised in a tropical country, and a fair-skinned, soft-skinned automaton (mechanical doll). An erotic adventure action story woven by this black-and-white, mismatched duo, begins!!