If you're looking for manga similar to Queen's Blade Rebellion: Kedakaki Chikai (Light Novel), you might like these titles.
Shouji, who was born in a poor family, had the qualities of a "yuusha." However, he was passing his days as a sloth, drowning himself in alcohol and potions. While relying on only violence to make a living, he encountered a girl who is a talented alchemist, but also mired in debt. Potions created by this little girl were mind-blowing as it had the highest purity he had ever seen. He was through with fame and honor. He no longer had the desire to only make money to live as his purpose. He felt it wouldn't be so bad to smuggle those potions in the underground world of crime and drugs. Brewing this restorative item that gets people high, in search of dirty money and comrades for his gang, hanging onto the potions that let him loose, the mad "yuusha" challenged the demons who are hidden in this demi-world.
In a mysterious academy town where people with abilities gather, the student council president who is known as the strongest in history is currently sealing off the academy, all the students are under house arrest. Only by defeating five dominators in a “duel” will they be able to regain their freedom. Those who choose to rebel are known as heroes, but Ryu who can only “create a doppelganger within three-meter radius” is completely unsuitable to engage in battle, so he is one of the numerous “Observers” remaining. However, on one particular day, since Ryu obtained a sword by chance late at night in the campus, the power level of the academy has been completely toppled, Ryu stood up as a “Brave”! Using a sacred sword and demonic sword to open his path, let the academy battle begins!
A great war has raged for years between the scientifically advanced Empire and Nebulis, the realm of magical girls—until the youngest knight ever to receive the title of the Empire's strongest meets the princess of the rival nation. Though they are sworn enemies, the knight is taken by her beauty and dignity, and the princess is moved by his strength and way of life. Will the fighting between them ever be allowed to end?