It's been four years since Osamu left his hometown, Kyoto. He returns to town expecting a short trip down memory lane, only to be kidnapped by one of his ex-girlfriends. But it's not just one. Osamu has several crazy dames vying for his heart, and sometimes his blood. One of them is even a Shinto goddess, Izanami.

After his house is destroyed on the night of his return, Osamu is forced to live under the same roof as his four exes, a fate he thought was worse than death. He had no idea the scale of the mess he was getting into, nor the far-reaching and horrifying consequences it would have on the world.

With each new addition to Osamu's newfound family, he finds himself getting more involved with the Shinto gods and the supernatural world at large, forced to fix the rivalries and political conflicts left behind from the First and Second Great Holy Wars.

Witness Osamu's extraordinary life, starting from his early days as a young man living with his exes, and wrapping up towards his harrowing transformation into world's most dangerous, international criminal and one of the two instigators of the Third Great Holy War.