MTL - History’s Strongest Senior Brother - ~ 1773. One gasification Sanqing!

Lyle Walt is a young noble boy and heir looking forward to the day he can inherit his family’s territory. Except around when he was 10 year old, his parents started neglecting him more and more in favour of his little sister, Celes.
On his fifteenth birthday, he is challenged to a duel by his sister to see who will inherit the household and horribly loses, being cast out of his family. Afterwards, he gets treated by the family groundskeepers and receives the family heirloom Gem from him that Lyle’s grandfather had entrusted to him. From there, he begins an aimless journey with his childhood friend and former fiancée, Novem, and the Gem-turned-Jewel that houses the memories, personalities, and Skills of seven of his ancestors.

Transmigrated to the world of Demon Slayer, only to become a swordsmith?“Then I'll forge the strongest Nichirin Blade!”With each hammer strike against the iron ingot, a notification appeared...[Impurities -1]After a hundred refinements, another notification...[Constitution +1]Upon completing the weapon, a final notification...[Current Weapon Sharpness Level: 1][Forgemaster: Strength +10, Constitution +10, Agility +10, Speed +10][Reward: Sun Breathing Technique!]“Maybe... I should become the strongest swordsman after all?”

An ordinary office worker, bound by routine and indifferent to fantasy, finds an unexpected spark in his vibrant senior colleague. Their quiet connection grows through late-night conversations and shared meals—until a sudden accident turns a mundane life into something else entirely. In the stillness that follows, a new story begins.---Disclaimer:English is not my first language, so please forgive any grammatical or spelling mistakes.

Throughout heaven and earth, I alone am powerful