The Yin-Yang Master of Another World

There are monsters in this world.

When all things awaken their spirits and become sentient, they are monsters.

There are demons in this world.

When the evil thoughts of the human heart give rise to them, they are demons.

There are ghosts in this world.

When the souls of the dead remain after life has ended, they are ghosts.

There are strange beings in this world.

When old objects gain intelligence and manifest supernatural powers, they are strange beings.

There are half-immortals in this world.

With one yin and one yang, one who commands and one who wields the arts, their magic is boundless, yet the path to immortality is arduous.

There are immortals in this world.

Solitary yin cannot give birth, and solitary yang cannot thrive. The path of yin-yang immortality stretches endlessly, so live this life in carefree freedom.

[Setting of this novel: Mages (yang masters) specialize in spells and supernatural arts.

Commanders (yin masters) specialize in controlling spirit familiars.]