I can return to the age of mysterious - Chapter 78 - 0 Four Major Killing Moves (23)_1

Transmigrated into the world of High School DxD, Roy believed he had been handed a life of luxury and glory. Born into the prestigious Lucifuge family, with his Sister Grayfia as his strict yet devoted older sister, he thought he was destined for greatness. 99,997… 99,998… 99,999… 100,000!!But... reality proved harsher: Roy lacked demonic talent and, despite years of training, remained a Low-Class Devil. his peers effortlessly achieve High-Class status, he’s been trapped in a cycle of endless sword practice and ridicule. Yet, he refused to accept mediocrity. Ten thousand sword swings a day, relentless training.. Until one day..[Ding! The Strongest Demon King System has been activated. Access functions to learn more.]---- High School DxD - Main World!1 - High School of the Dead [●] - First2 - Demon Slayer [●] - Second3 - Akame Ga Kill [●] - Third4 - Bladedance of Elementalers [●] - Fourth5 - Campione [●] - Fifth

You Liangxing would never open the speech function in game.
That was because his voice was…
Particularly! Kittenish!

But there was one day, he queued up with a teammate who had so much to say that they may as well explode. Vexed to the point of no return, he contributed a voice that was capable of splitting heaven and earth, “Don’t BB.”
The other party who was being scolded stilled. In the ensuing silence, he suddenly let out a long, relishing… Moan.
You Liangxing: “…..”

Later —
He realised that the person was a great god,
Much later,
Without him realising,
He became the great god’s royal healer.
…. And also his boyfriend.

- Description from Novelupdates

There’s SIS in great Britain, CIA in the US. In Huaxia, there’s Dragon Division, known as the mysterious power of the East.

“Haunted by the Curse's relentless pursuit, one seeks solace in the arms of darkness...”-- -- --Hael Winterlock, the youngest and most beloved prince of the Winterlock dynasty, lived the typical luxurious prince life within the dynasty, with the thought of being just an ordinary rich royal member in the future.But when he awakened the never-before-seen Nine Magical Arcana Runes petals, the law of the Kingdom automatically dictates him as the next ruler of the throne, something that goes against his predetermined fate.And from thereon, life came crashing down for Hael, who had his father killed by his throne-obsessed brothers, and then he himself burnt to coal and flung into the icy depths to drown to death.Just when life seemed over, Hael found a portal and a moon fragment, a rumored source of controllable power at the depth of the sea, and the moon fragment fused with him as he disappeared into the strange portal.There was a new advanced world, a world where an ongoing war between humans who grew with cybernetic fusions, and the Eldritches, creatures of dark magic, raged on.Once more, he was given a chance to change things, a new chance at life.One day, he swore to return to back to Winterfall Dynasty to take what was rightfully his. But only if his dreams could be reality. The Forgotten Realms had another name:The Abyssal Realm of Ruins, a Place of No Return!