Lilia, the newborn daughter of a marquis, has the memories of her previous life! With cheat-like gamer knowledge she aims to become the strongest girl in this new "other world"!

The moments Keisuke Niijima shared with his wife, Takae, were the happiest in his life. After their first meeting as coworkers, the bond between them gradually became stronger. They eventually married and were blessed with a daughter named Mai soon after. However, following Takae's death, time seems to have stopped for Keisuke, resulting in his inability to build a proper relationship with his daughter. Ten years later, the gloomy Niijima household is bound for change when a little girl knocks at the door—claiming to be Takae's reincarnation. After confirming her identity, Keisuke's world brightens once more as he revels at the thought of making new memories with his beloved family. Unfortunately, this fortuitous miracle comes with its obvious drawbacks, and one mistake will spell more tragic consequences for Keisuke and everyone else involved.

A town is attacked by a deadly creature, it can only be stopped with the Dragon Blade. The one person who knows where the blade is won't tell Lang, and even if he did, untold peril will fall on anyone who dares to find this legendary weapon.