Fumiomi is a timid high school boy who cannot even rescue a single girl being hassled by ill-mannered men. One day, a grotesque woman suddenly appears, grabs him by the arm, and drags him into a black shadow... When Fumiomi wakes up, he finds himself in a ruined parallel world where grotesque, black, human-shaped "Shadows" indiscriminately attack people. As Fumiomi resolves to stand up despite his paralyzing fear of the shadows, Raiten, a beast-eared loli claiming to be the goddess's messenger, speaks to him: "Kiss the girl of your desire. By doing so, your two souls will overlap into one, allowing you to transform into 'Jyukuu Shin-i'—a power that transcends human limitations"...!!