One Piece: Fist of the World - Chapter 61: Attention from the Navy Headquarters

Every night, he prayed. To every god on Earth.“Please, transport me to a fantasy world when I wake up tomorrow.”And then one day, his prayers were answered.Just not in the way he had hoped for.

When my whole class got summoned to another world, I was the only one to encounter a divine being on my way over.And when everyone started getting Systems that were to define their fates?I've got an FFF-Rank Failure System.And to make matters even worse, it bugged out as it attempted to launch, teleporting me to the centermost point of the world, right where the strongests of the monsters resided.Right into the lap of a Tyrant's Puma!But what's with that sparkling glinter in the distance, that comes bearing down the weight of our shared destiny?And who's looking down on a chessboard, smiling as the pieces are starting to move.The divine intervenes. The ancient prophercies finds fulfillment.The purpose long gone awakens as the universe's destiny weaves itself into the fate of the two entangled souls.

When an S-class elite assassin-raised captain of a special ops suicide squad comes home from a high-stakes Africa mission, he finds himself offered something that could potentially set him up for life- a curious assignment that he could use to finally exit his days of war and slaughter.

Then placed into a high-school setting, Lin Yi is tasked by the chairman of a top-tier multi-billion company with bodyguard duty for non-other than his own daughter, a certain little Miss of said high-school.

His enemies, once ranging from drug lords, mafia bosses, political figures, and national leaders, are soon replaced with spoiled kids who happen to have rich papas and mamas, and Lin Yi finds his intense expertise and high-threat skillset misused, and very underwhelmed…

But he does get a harem cast as diverse as his old enemies, so Lin Yi decides that, for the sake of messing around with girls as an invincible entity in a down-leveled environment, leaving his bloody and death-filled war days behind is something he’d definitely want to strive for.

- Description from Novelupdates

Kaito Nakamura, a shy university nerd, thought he’d found love when the stunning Aiko chose him as her boyfriend. Their sweet, fluffy romance fills his lonely world with hope—until he discovers she’s cheating on him with multiple guys, reveling in the taboo thrill of betraying someone so innocent. Heartbroken and humiliated as explicit photos of her circulate online, Kaito’s tears are interrupted by a mysterious popup: the “Revenge NTR System Beta.” Promising retribution but with a chilling condition — he can’t break up with her.Contains Ntr, read at your own risk