Jace and Lorenzo are on the way to academy. Jace finds out that Lorenzo is an innate fanny magnet and wonders if something was wrong and his cheat went to him. Then in a town along the way, Jace is walking alone. He encounters some thugs who kidnap him and try to sell him as a slave. At the last moment, his guard entourage arrives and saves him. They tracked him using his ring which was actually a tracker. Jace is a little bit in shock and thinks of ways to prevent somthing like this from happening again.
In the academy, J&L(Jace and Lorenzo) are given the same room in the dorms. The next day is a new student meeting party kind of thing. There, J&L find a girl (girl #1) standing in a corner. They go and talk to her. The girl #1 is at first somewhat attracted to Lorenzo but then manages to get her head straight and talk to Jace. Jace's mouth hangs open as she was the first girl who actually talked to her when Lorenzo was around. They talk and the three become good friends. Just then, Jace turns around and sees a girl (girl #2) entering. Even though, the girl #2 is just 6 years old like them, she absolutely blows his mind away. Just when he is about to go greet her, he remembers something and turns to lorenzo. He begs him to not appear in front of her and go somewhere else. Lorenzo is confused but does it. So Jace goes and meets the girl. They talk and play and walk and eat, etc (End of Thinking Capacity). Then the night is over.
Next day is the start of their classes. The first 3 years are basic so everyone has the same course. J&L and girl #1 are in same section while girl #2 is in a different section. Jace always goes to girl #2 to talk to her when he has free time. He is totally enamored of her.
One night, when Jace is studying in his dorm room, he sees that candle lights aren't really that good, so he thinks of making the convenience he had in his previous life. The first thing he needs is electricity and a generator for that. When Jace finally makes it and switches it on, his mana in his body goes haywire and after somehow turning it off, he and Emi come to know that mana and electricity are inter-related and influence each other. Due to this, normal wires and generators cannot be used. But Jace and Emi somehow find out how to use mana in place of electricty, and vice-versa. So, batteries can be used to power spells and mana can create a network like the interner, which Jace names mana net.
The relationship of Jace and girl #2 progress forward, and they start dating. Since, Jace is a reincarnated person and had read a lot of novels before he started his research, he knows that Lorenzo, who now is a total playboy, is the stepping stone antagonist material. He knows that he cannot stop him so he tells him to tell him everything he does and ask for his permission first. In the meanwhile, Jace also completes the mana net. He becomes its owner, while Lorenzo and girl #1, who helped a lot, become the admistrators. He releases the mana net for public use, where anyone can find aything they want on the net. Jace also uses it as a way to get into their brains and effectively control them. He did not really have any ulterior motives. He could so he did.
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Even though, he totally trust girl #2 but due to his previous life trauma, he uses the net to spy on her. He finds out that she was cheating on him. In his rage, he twists the mind of the girl and the boy she was cheating on him with. But Emi stops him from doing the same to both their families and become sane again. He apologises to Emi for his deed and cries on his bed till the next day, when Lorenzo and girl #1 come to meet him. They see the tear marks on his face and ask him what happened. He says nothing and goes to wash his face.
After some years, It was time for their graduation, and the monarch exam. The aristocracy is based on ability and so is the monarch. Jace just filled in the paper like usual and goes to his room. He did not have any thoughts on becoming the monarch and would be more than happy to be just the prime minister. But, somehow, he tops the exam with Lorenzo coming second, just 1 point less. He says that he does not want to be the monarch. But the people say that the law cannot be broken, so he gives his first and last order as the monarch which was to make Lorenzo the monarch. Everyone is stunned but they follow his order. Lorenzo thanks him and goes to complete the ceremony.
Everything goes as usual. Jace releases some satellites to get to know the planet and he sees that al the land mass is concentrated on one side with the other side being totally water with a small crystal island in the center. He goes to investigate it and girl #1, who became the principal of the academy, comes with him. They find that the crystals were mana crystals, solidified mana which was slowly leaking into the atmosphere. Jace had always wondered, as to from where did the mana come from. He investigates the island more and finds a broken machine. Jace, Emi and girl #1 disassemble it and study it. They find that the machine turned energy into a different kind of particle which was mana. They repair the machine and install it back. Without this repair, all the mana in the world would have been depleted in a hundred years.
When they go back, Lorenzo tells him that he raped a village girl when he went there without asking for Jace's permission first. All the blood leaves his face and he hurries to connect to the net and investigate the girl and all her connections. There wasn't anything special but Jace found that the girl had a total siscon brother. The brother was a waste. But when he investigated the brother, he found clear signs of an MC's hegemony aura activating on him. Cold sweat starts flowing on his forehead, before he calms down and kills him the same way he did with girl #2. Then he goes to Lorenzo and totally beats him up.
After sometime, when he is in his mid 30's, I don't know what but it is done by Emi, but something happens and he comes to know that he is in love with girl #1 and she too is with him. They marry and live happily ever after.
Meanwhile in the background, Emi says that seeing her love being happy is best thing she could ask for.