Lord of Penumbra

Everyone has a shadow, but my shadow is a penumbra! ... Joey, who just took a nap and traveled to a magical country, found himself in a classroom, surrounded by students with different blue eyes, black hair, and white skin. After a brief understanding, Joey learned that in addition to the technology tree being similar to the original earth, this world also has mysterious powers. The power of shadow! Everyone has the opportunity to awaken this power after being admitted to a higher education institution, and Joey found that there seemed to be some differences in the shadow power between himself and others. Because his shadow seems to be just a penumbra...