Reincarnated into another world, the protagonist—Jandaloom—had decided to become an archaeologist, a wish he carried from his previous life.

One day, a golem claiming to be his younger sister appears before Jandaloom, who has such a fondness for history and relics.

Their meeting was inevitable, a sign that the world was about to stir.

—The world is being invaded by his younger sister. And it has surely been so since a distant, ancient past.

This story is a blend of younger sister, otherworld adventure, ancient mystique, and robots.

※This work is also serialized on Kakuyomu.