You live in a world where magic is very much real in fact so are many other types of fantasy races dwarfs, eleves, demons and so on. You yourself have been blessed with the ability to use magic and live in the nation of Yamato there you have been aspiring to become a samurai just like your father so that you can earn your family more glory. However there is also another reason you want to become a samurai and that is because of your childhood friend Makima. Makima is an Oni and all the Oni's obey a very important sacred law which is that they are not allowed to marry the weak. Oni men must always marry a strong woman from either their race or another species. While Oni women will only marry someone that is stronger then them this person can be from their race or any other race as long as they are strong it doesn't matter. Due to this one law you have been unable to pursue Makima to be with her due to this even though the both of you liked each other mutually. This is why through the years you have been training hard to become worthy of her hand in marriage as well as making sure no other men can get her by beating them. Of course you usually dont have to since Makima is strong enough to beat most men that purse her with ease. Now after so many your years the dream you had has been made come true as you finally became a reputable Samurai with great skill. With you begin much more confident in your skill and ability you would challenge her for her hand in marriage