The First System User

War never ends, but the lives that are involved do.

The world has changed.

Dungeons have appeared all throughout the world, scattering in cities and villages.

And monsters of all kinds and legends have emerged from it, killing everything in its way.

One soldier, one man, dies fighting one of the most powerful of the monsters and dies, to be awakened on the same day of his death, to repeat the day till there is no mistake, and so he may he live the next day, to kill and to save.