I'm The Devil - Chapter 50: Tartarus Merge With Hell

The world that nurtured the civilization which reached the pinnacle of magic was on the verge of destruction.
The last survivor transmigrated to the past, when the magic civilization started growing, as countless mages were still fumbling their ways through the thorny paths of magic knowledge.
He, who came from the end of the magic era, aim to reach the pinnacle of magic.

- Description from Novelupdates

Living in Tokyo, using the Mind-reading Extraction Skill, I thought I could become an all-powerful superhero, but instead, I got dragged into a twisted cycle of love?! Without even a moment to mourn my youth, the one who immediately rushed to the battlefield was— Kiryu Hina (ex-girlfriend), “Remember, this is what you owe me.” Ayakoji Chiyoko (current girlfriend), “Break it off with that woman immediately!” Kohinata Motoyo (rough target), “Please, I’ll do anything!” Ai Cheng Hua Lian (always losing), “Huh?” Kagura Hikaru (protagonist), “...........” My youth romantic comedy can’t possibly be this twisted!!!

Humanity has conquered half the galaxy and the Age of Mechs reigns supreme!Ves Larkinson lacked the genetic aptitude to become a famed mech pilot. Fighting against his fate, he studied mech design in order to express his love for mechs as a builder instead of a soldier.When Ves graduated from college, he returned to a new but empty boutique. Left with a small, newly founded mech workshop that his father painstakingly built with a mountain of debt, Ves somehow needs to make ends meet with the bank breathing down his neck.In the midst of his despair, he found salvation from another legacy his father had left."Welcome to the Mech Designer System. Please design your new mech."--Join The Mech Touch's unofficial Discord server: https://discord.gg/APB5KCU

In her last life, Qu Zhi tried her best to be a good wife who was sensible and did not cause trouble, a filial and good daughter who helped her family, and a good mother who accompanied her children. However, Qu Zhi worked hard and suffered all her life. When she was about to die, she realized that in the end, all she got back for her hard work were complaints. Her husband complained that she was an idle, rich wife all day long who wasn’t satisfied with her happiness at home, and that she was a greedy woman.

But after decades of marriage, her husband had a firm, deadly hold on all her money, and she didn’t even have a dime to her name, nor a property to call her own. Every time she asked for money, he would trample all over her self-esteem. Her husband’s cold and sarcastic words made her unable to lift her head, and his friends would demean her while drinking wine, making her tremble with anger. This man had once said he would take care of her, yet he turned a blind eye! Those people focused on her happiness as a topic, and made a joke out of it.

Even her three children resented her for her uneven love towards everyone, and their relationship only became more strained as time passed. She had spent her whole life as a loner, and she had nothing. Lying on the operation table, Qu Zhi thought that if she could do it all over again, she wouldn’t be a housewife. She wouldn’t have given her second daughter away, and she wouldn’t take care of her blood-sucking relatives.

She wouldn’t marry her indifferent, cold husband either! When she next opened her eyes, she was back to twenty years in the past. Her eldest daughter was still in elementary school, and her second daughter had been in her belly for several months…