Mitou Shoukan://Blood-Sign - Volume 10, Ending X-02: The Age of Awakening Has Arrived

Penny has three brothers: one is a billionaire CEO, the second is the youngest military lieutenant, and the last is a successful actor.These three successful men had only one common ground: bullying Penny, their sore-eye of a little sister. The sister they never wished to have, and the one who claimed to be their real sister, while the sister they treasured all this time was a fake.After living a life of maltreatment in her aunt's home, some people of high standing came to Penny with news of her real parentage. She thought she was finally saved from her aunt’s clutches, unaware that what awaited her was worse.At 13, Penny only wished for one thing: for her brothers to love her and treat her like family, just as much as they loved their fake sister. She worked and studied ten times harder than anybody else just to be accepted by them. In her desperation, she foolishly fell into a trap set by a malicious person, not knowing her actions would result in the downfall of her brothers and her ending up in jail with a death sentence.On her execution day, Penny had only one thought in mind:If she ever got to go back in time, her brothers could pamper their fake sister for all she cared! She wanted nothing to do with them! And much to her surprise, Penny found herself back on the day it all began: the day she was born.As promised, this time, she wouldn’t foolishly try to earn her brothers' love and affection. Never mind family! She’d just make a lot of money, live in luxury, and make a family of her own!But wait, why is it now that she didn’t want anything to do with her brothers, they kept poking their noses into her business? Weren’t they supposed to pamper their fake sister? Why won’t they leave her alone?!And how on earth was she married in this lifetime? To make matters worse, this husband she never had in her first life was suddenly volunteering to be the father of her children?!

The first thing my childhood sweetheart's did after becoming a wealthy woman was to ask me to marry her, in my poor and destitute state, went to her family to become the son-in-law.“Marry me, and you can live in luxury cars and mansions as you please.No need for work or household choresPlenty of pocket money every day, amounting to a five-figure sumAnd if you want kids, I'll bear as many as you wish.”But when I became this toy boy, I gradually discovered the sickly yandere and perverted control side of my childhood sweetheart...An accident brought me back to the past, live my life again.This time, facing the temptation of childhood sweethearts, I decisively refused!In this new life, my slogan is, drum up the wallet, and stay away from the rich woman!Me: “Sorry, I am the man you can never get in this life no matter how much money you spend!”

Doomsday comes, and human beings enter the heavenly world.
Ten years later, Yang Chen, who was betrayed tragically, returned strongly with the Tianyu bug. In this life, he vowed to make the betrayal pay the price. He has a powerful bug bonus, just like an open hang. Frightened to hear…

- Description from novelbuddy

15 years ago the world discovered magic as well as mythical beings (basically beings from various legends) in another dimension. Humankind learned to summon these dangerous mythical beings and use their power to great effect. Seven countries formed contracts with these “mythical beings” and gained their allegiance as a result. The mythical beings will choose their summoners on their 14th birthday and give them a stigma. Schools have been set up to train summoners and magical swordsman (basically bodyguards that give the summoners time to cast their spell) as a result.

15 years later after the finding of magic Kazuki Hayashizaki is chosen as a summoner and given a stigma to indicate that. This is surprising since males aren’t chosen as summoners due to their low amount of mana compared to females. As the first male to be a summoner Kazuki is under a lot of scrutiny by almost everyone.

To complicate matters his sister (who’s a magical swordsman) is against him going into summoner school to train there as a summoner. Because summoners and magical swordsman have a cat mouse thing going on where summoners look down on magical swordsman as inferior so his sister naturally is against him going there. She’ll stop him even if it means going to war.

Kazuki however is determined to thrive in summoner school and has already determined to give it his all. Even if he’s the lowest ranked student (ranked E) and his fellow students intend to demean him he’ll prove himself as the strongest summoner.