My premise:
Man finds himself in an [[alleyway]] with no memory of his past, but a strange object, and encounters [[allies]] to survive an extra terrestrial [[robot invasion]].
Alleyway
The protagonist finds himself in an alleyway in Tokyo, Japan, with nothing but a [[strange object]]. He makes his way into the city, and starts learning about the world and the culture.
Allies
The protagonist meets a man at a restaurant, and describes his situation. The man takes him in, as he ironically has taken in a girl years before that has the same issue.
Aside from the man and the girl, he is also rooming with a man from Hawaii, and once the invasion starts, they are joined by a neighbor, the mailman, and two other girls that the friends with the main girl.
Robot Invasion
One random day an attack ship full of different alien robots descends down on earth. They start hunting down and killing everything that lives, along with laying waste to the city. The robot origin is from a portal lightyears away, which seems to have also spewed out the robots’ planet, which is making its way towards earth.
Strange Object
The strange object found with the protagonist is a belt, made from some strange metal, with three orbs. one in the front, and two on the sides. 