Tomodachi no Imouto ga Ore ni Dake Uzai - Volume 4, Chapter 3: Only towards the little sister, memories of the friend are a topic

Venshiro, a young ronin bound to the Black Vein Blade, is hunted by clans who would kill for the curse he carries. Every time he draws the sword, it takes something from him—his memories, his soul. But the blade remembers everything.And now, it wants more.

Trample over the proud, suppress myriad paths!To vie for the ultimate way, only I, the Sword Sovereign, shall stand supreme!My sword may seem ordinary at first glance, but rest assured, it will be your end!

“The Demon Lords are bringers of destruction, and among them, I am the strongest.”The Demon King has fallen, slain by the Hero in a battle that shook the heavens.After this, humanity knew a long era of peace and prosperity, with the hero now at the top of the world.Fifty years after the battle, the demon race is resurfacing, but now with the throne empty, they must fight for the emergence of the new Demon King. Meanwhile, the humans are preparing for the rise of the next hero who will oppose their archenemies.Born as a mere stable boy in a lower-class noble household, Bel has lived his life tending to the noble gardens, pruning roses for banquets he would never attend. He is nothing more than a lowly servant in a world ruled by noble bloodlines and magic.However, his fate changes when a demon attack devastates the household. As flames consume the estate, Bel is about to be executed in front of his master when their leader, a great demon, recognizes him as a member of a powerful species of monsters that had disappeared before the ascent of the previous Demon King.She calls him by his true name, awakening his true blood.The demon, intrigued by this discovery, decides to spare him out of curiosity and pity. Having learned about Bel’s true nature, his master, rather than executing him, chooses instead to bring him into the heart of his household, seeing in him an opportunity to elevate his family’s standing by binding a powerful being to his service.But power cannot be shackled forever, and among them, the one in Bel's blood is the most dangerous.

The most successful businessman of his time, who started from being a homeless orphan, died indignantly because of being plotted against by his most trusted aid, his own brother.