A girl dressed in black appears before a boy and asks who he is. No matter how much the boy searches, he can't find the answer. Unbeknownst to him, this brief encounter would serve as the impetus for the start of a long journey.

This is a story about two boys. One explores the world, but the other remains cut off from the world. As one meets various people, the other clings to a comatose girl. And one can accept whatever he perceives, while the other cannot due to a strange power in his left eye that affects his perception of the world. Where will the former's journey take him, and what will the latter ultimately accept as reality?