Hyoudou Issei had lived for many years, in fact, he already forgot how old he was. One day, a cute girl asked him out. On their first date, she tried to kill him. Too bad he didn't die. Oh well, what was this? 'Your life will belong to me? It seems that his life would turn out to be more interesting. Angel, Fallen Angel, Devil, finally his life won't be boring anymore!

Louise Valliere wanted a strong familiar to prove that she wasn't a failure. What she got was the only living Contractor in existence, Kazuma Yagami. Crossover between Zero no Tsukaima and Kaze no Stigma.