MTL - Studying Science in the Alternate World - Chapter 169 sea ​​of ​​fish

A man with a lifelong martial arts background, raised in Asia due to his family's profession, moves to the US for education and work. He discovers Historical Medieval Battles through a colleague and becomes deeply passionate about it. He trains hard and becomes skilled enough to represent his country.During a competition, his armor fails, and he's struck in the head with a two-handed axe, seemingly dying. But is this truly the end?

Seratus tahun yang lalu, Ordo Cahaya mengalahkan Raja Kegelapan dan mendirikan pemerintahan yang mereka sebut era perdamaian.Namun, di balik senyum para penguasa Cahaya, tersimpan sistem yang menindas. Orang-orang yang dianggap “kotor” atau “berbeda” dimusnahkan atas nama kemurnian. Siapa pun yang mempertanyakan Ordo dituduh sebagai pemuja kegelapan dan dihukum mati.Namun, ada rumor yang mengatakan bahwa sisa-sisa kekuatan kegelapan perlahan-lahan bangkit. Seorang pemuda misterius bernama Kaelen, yang memiliki darah gelap, mulai mengumpulkan pengikut untuk menumbangkan tirani Cahaya. Mereka tidak bertarung untuk menghancurkan dunia, tetapi untuk mengembalikan keseimbangan dan mengungkap kebohongan Cahaya.

Qiaosheng, you are the one who saves me, yet you are also the one who gives me hell. If we cannot grow old together, I’d rather we’ve never met before.

- Description from Novelupdates

Haruto Hayase was a normal high school boy in his third year, living a quiet life until his younger sister, Haruka Hayase, joined the same school. Haruka’s beauty and charm made her the center of attention, quickly becoming the school’s prima donna. But when a notorious gang leader set his sights on her, he did everything in his power to protect her—only to fail tragically. Haruka was brutally assaulted and tortured, and Haruto himself suffered an agonizing death. However, in a twist of fate, Haruto is given a second chance, waking up a year before the events that shattered his life. Armed with the mysterious ‘Debauchery System Slave’, he vows to exact revenge on those responsible. This time, he will use his newfound powers of the system and charm to seduce the loved ones of his enemies. From their mothers, sisters, and lovers to their closest friends, Haruto will make them his. His enemies will suffer as he steals what they hold dearest, ensuring their downfall in the most devastating way possible.