Half Demon Heroine

In a world of heroes and villains, sometimes, heroes have unexpected origins. Such as being the direct, half-blooded descendant of a powerful demon. And you'd expect, of course, the drama - surely there is some familial resentment here, but... Nope. Just a daughter with a father who occassionally walks in and tries to get the clerk to sign a contract handing their eternal soul over while she cringes. Mind it not.