In the world of Sykerion, magic exists. Along with magic, a world phenomenon known has the "System" is something that people take for granted.  Although the world contained magic and the "System," the technology was equivalent to the medieval era as we would know it. Similar to what one would find in an "Video-Game based light novel," they can recite "Status" in their minds to bring up a magic screen that can only be seen by themselves. The "Status" screen displays their abilities in numerical values, along with descriptions of their abilities. Their status can be recorded onto a magic plate that automatically updates itself based on changes in "Status." Unlike in an actual video game though, they cannot input "Stat points" or "Skill points" to influence their growth, and can only grow naturally.

During the year 434, a man named Thoth was born in the capital city known as Krystalia. At first, people believed that he's probably retarded due to the fact that he didn't even make a single sound ever since he was born.  At the age of 6 though, just before his parents would give up hope on his future, he spoke his first words. Actually, he spoke a full proper sentence, and displayed knowledge beyond what a child should know. Although his personality and speech patterns were dull and apathetic, his parents still loved him none-the-less.

Soon after, out of boredom, he decided to train his magic, becoming a prodigy at an extremely young age. At the age of 8, he started to train his body along with practicing magic, and took hand-to-hand combat lessons from his father. Showing even more improvement in his physical abilities rather than magic, he decides to become a fighter rather than a mage. At the age of 10, he obtains permission from both parents to travel on his own, travelling on a journey to "find something fun to do."

At first, he became well known for his wide range of magical abilities, able to manipulate any and every element known. Raising his reputation, only after 5 years passed by was he forced to finally display his physical abilities, during his participation in an annual tournament. In the finals, he blew away his opponent with a single punch, and caught the attention of the king.

He was requested to become a hero for the kingdom of Atalin, which he accepted due to his interest being piqued at the thought of fighting the demon lord. Awaiting the arrival of the demon invasion, foretold by the oracle, he trained for the next 11 years, and finally the invasion began. He repelled the entire demon army back within a year, and fought a final battle with the demon lord, who was stronger than he predicted. At the end, as the price of completely obliterating the demon lord, he received a fatal wound straight to the chest, piercing his heart. Slightly disappointed that he couldn't find a hobby for himself at the end, he was satisfied that he was actually killed in battle. As he closed his eyes, waiting for death, he hears a voice in his head that he was very familiar with.

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"[Demon Lord] has been defeated. Received [Error] experience. Level has been increased."

'Heh, what good does that do when I've already reached the maximum level possible.' He thought to himself.

"Conditions for [Second Life] has been fulfilled. Obtained skill: [New Game Plus]."

Unable to hear what the system says, his mind drifts off due to the heavy blood loss from the wound. The pain slowly begins disappearing, and a feeling of relief runs through him. Strangely though, the surroundings around him becomes warm and tight. When he opens his eyes though, everything is completely dark.

'Is death supposed to be like this?' He tries to move around, but the walls are extremely slippery and something is attached to his stomach. Soon enough, something grabs his head, and pulls on him. He doesn't resist and closes his eyes, waiting until the force finishes pulling him out whatever he's inside of. It feels similar to emerging from a monster's mouth after letting yourself be eaten alive to kill it from the inside. Why would he know such a thing? Because he did it as an experiment in the past, to see how dangerous being eaten alive was.

When the process is finally finished, he attempts to open his eyes, but they are momentarily blinded from the bright light of the environment around him. He waits for his eyes to adjust to the light, and reopens his eyes. He sees a man right in front of him, wearing a small white cloth around his mouth, and wore strange clothes that he's never seen before. Realizing that the man in front of him was actually able to hold him, he unconsciously used magic to determine the situation around him, and realized that he's much smaller than before. He also noticed that a certain part of him was missing.

'Life is seriously playing a joke on me now, huh?'

Based on what the situation he found himself in, he realized that he has been reincarnated into a baby. Not only that, but a female as well.