Global Killing: Awakening SSS-level Talent at the Beginning - Chapter 2:

The dawn era after the end of the half century has gradually rebuilt the order, abandoned civilization, and is full of undivided violence and desire.
The noble and powerful pioneers are in charge of the city, and the evil and mad plagues are in the wilderness.
Pure human beings who cannot mutate are the weakest, dominated by the rulers of the pioneers, and are not as good as animals in the wilderness.
A purely humanized young man with a worldly experience has quietly entered the WTO, holding a three-foot long knife and a long-distance desire to boil in the world of purgatory. From the nameless name to the sorrow of the Supreme Court, the name of the black ride is resounding!

- Description from Uukanshu (translated)

After all the things that he had done in his life, Alex realized that it was already his time to die.

In the autumn of his second year of high school, Tsujidou Masachika had just been appointed as the student council president when he found himself helping a student who was suspected of smoking in school.Her name was Ooba Monaka, a junior gal rumored to be a beautiful girl.He helped her on a whim, with no intention of getting involved. At least, that’s what he thought until…“I’ll do anything to thank you, Senpai~”For some reason, she became extremely attached to him!She would barge into the Student Council room every day, help with event preparations, and even go on dates. Gradually, Masachika and Monaka get closer as she aggressively narrows the distance between them.In the midst of it all, it turned out that the ‘suspected of smoking’ accusation was actually due to malice…?A sweet romantic comedy with a cheeky and cute junior gal begins!

Shi Qing Xia is practically an angel.

Kind, sweet-hearted, and good at her studies, she was admitted to the top university in Taipei.

However, the living expenses for the metropolitan city were far greater than she had ever imagined, so she started to work as a private tutor for wealthy families to make ends meet.

On her first day of work, she met Zhao Yi Bo and Zhao Yi Xuan, a pair of neglected 16-year-old genius twins whose prosperous and wealthy parents heartlessly abandoned in Taiwan. Shi Qing Xia found them to be gentle, compassionate, friendly, clever, mysterious, pitiful and attractive.

But appearances can be very deceiving…

Because behind those sweet smiles…

Deeply twisted and cruel demons lurked, waiting to rip apart the wings of this angel, condemning her to an eternity of conflicted bittersweet suffering — a rollercoaster ride of a heart-wrenching, twisted, and tragic romance more extreme than what someone so innocent could possibly imagine.

- Description from Novelupdates