In a fictional world where humans, demons and monsters coexist, Chen Changsheng comes to the capital of gods with a marriage certificate in order to change his fate. Together with a group of young heroes, he waged a desperate battle against the forces of darkness. At the same time, he also harvested love and started his journey of rising as a powerful man in the capital of gods.

The entire universe is divided into the inner universe and the outer universe. The two universes are enemies of each other. The outer universe is ruled by demons, and the inner universe is divided into The Realm of gods, the Eternal Realm, and the Mortal Realm. In the universe, there are countless mortal worlds like the Tianfa Continent, and they are collectively referred to as the Jiutian Xin Region. In the field of Jiutian Xin, nine immortal emperors commanded all star fields in nine layers. Above the nine heavens is the realm of purification of immortal gods.

Modern man Cheng Yan unexpectedly dies and his soul travels to a medieval European-style otherworldly continent, becoming Roland, the fourth prince of the Kingdom of Graycastle. This playboy prince saves the witch Anna at an execution scene and is shocked to discover that magic really exists in this medieval-style otherworld. When Anna, as a witch, displays her magical skills, Roland realizes that magic can replace some modern technology, so he formulates a "great development of magical industry" plan. Thus, in an era where everyone hates witches, the independent Roland begins to recruit witches, using their magic to transform Border Town and improve the lives of himself and the locals. In addition to using magic to develop industry, Roland also introduces modern business ideas to Border Town. Under Roland's leadership, people manufacture firearms, and Roland gains public support. As the number of witches in Roland's camp increases, the magical industry continues to improve. At the same time, Roland will face battles with great families and other princes and princesses. As his territory expands, Roland successfully creates a harmonious coexistence between witches and ordinary people, gradually bringing the western territory of Graycastle and even the entire kingdom under his rule, and slowly uncovering the secrets of the devil race and the Witch Empire.

Welcome to the fascinating world of Gensokyo, in which youkai (A term for all sorts of spiritual creatures), animals and some humans live, completely separated from our world by a magical barrier. The only gateway between the two worlds is the Hakurei shrine. Reimu Hakurei is the maiden working at said shrine. Whenever problems of supernatural causes (known as "Incidents") occur, Reimu goes out with her friends to investigate, eliminate the cause and hopefully restore Gensokyo to its equilibrium.