Inns on the Rhine

This is a world where martial arts and mages coexist, and all kinds of magical powers coexist. And this is also a brand new field, where fantasy such as soul reincarnation and so on exist. In this world, the dead will be merged into hell and ruins. Our male protagonist is a cold-blooded assassin who defected from the "Death Watch" (the model is based on his brother named Cai), and he will also take his sister to work hard to survive in this world, but will the world really be as they wish...