Prologue: I just woke up and I'm getting murdered

お家とは私たちがある場所だよ
我们的家是当我们在一起的时候。

Waking up with amnesia, Luz only knew four things. His name, his age, his purpose, and his state as a traveller. Now he has to travel this world, trying to fulfill his purpose.

The purpose he risked everything in order to travel to this world.