七つの大罪 [Nanatsu no Taizai] Series by Nakaba Suzuki

When they were accused of trying to overthrow the monarchy, the feared warriors the Seven Deadly Sins were sent into exile. Princess Elizabeth discovers the truth—the Sins were framed by the king's guard, the Holy Knights—too late to prevent them from assassinating her father and seizing the throne! Now the princess is on the run, seeking the Sins to help her reclaim the kingdom. But the first Sin she meets, Meliodas, is a little innkeeper with a talking pig... moreWhen they were accused of trying to overthrow the monarchy, the feared warriors the Seven Deadly Sins were sent into exile. Princess Elizabeth discovers the truth—the Sins were framed by the king's guard, the Holy Knights—too late to prevent them from assassinating her father and seizing the throne! Now the princess is on the run, seeking the Sins to help her reclaim the kingdom. But the first Sin she meets, Meliodas, is a little innkeeper with a talking pig. He doesn't even have a real sword! Have the legends of the Sins' strength been exaggerated. .. ? less

SIN VS VIRTUE. To save her kingdom, Princess Elizabeth has pinned her last hope on the infamous traitors, “The Seven Deadly Sins” and has set out on a journey with Meliodas—the Dragon Sin of Wrath—to seek out the rest of his fellow knights and former friends. Deep within an uninviting forest they find Diane, the Serpent Sin of Envy. Before they can celebrate their reunion, they must deal with an attack from Gilthunder, an electrifying Holy Knight!