Well Ene...it's a long and awesome story!
Once upong a time there was a young 17 year old kid living with his mother peacefully in Kichijouji, until demons attacked and killed his mother. He then tried to stop them and the US army from blowing up Japan with a barrage of ICBM's...but he failed, and through the sacrifice of the girl he loved, he ended up 30 years into the future...this place. The world he failed to protect.
*He smiles at them*
Anyway, things got better, and we're now rebuilding our world, this place, Valhalla is...kind of a place I founded alongside Cerberus and Madam. We're still working at making it better, and it's been 3 years already since we started.