"No food, no water, nothing! Why am I in this situation?"

Hikaru Koizumi was lost during the infamous invasion of Valenmoor.
In reality, he was so fed up with the ongoing wars and the division of Japan that he had intentionally made it seem like he was lost.

When he realized it was rather foolish, it was too late. He had accidentally gotten lost on his way back.

Fortunately, Hikaru is found by a girl, Akira Hoshizora, and a boy, Shigeru Ueda, in a forest near their military camp. Nihon is in serious trouble after losing the third battle of Taikai.

Matters get worse as Hikaru realizes he is in enemy territory. Even worse when he realizes someone precious is missing. He needs to find her while surviving in enemy territory.