The Seven Deadly Sins: Seven Days

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. He doesn’t even have a real sword! Have the legends of the Sins’ strength been exaggerated…? *Source: Kodansha Comics, Vol. 1*

A spin-off of Nanatsu no Taizai showing how Ban and Elaine met in more detail. In the land north of Britannia, there is a forest where humans are not allowed to go, and it is known as the "Fairy King's Forest." The one known as the Fairy King, Harlequin, has not been seen for 700 years. His younger sister Elaine guards the Fountain of Youth from human greed by herself. After many partings and 700 years of isolation, her tears are about to dry up. Then, a young man appears seeking the Fountain of Youth. That young man's name is Ban. Over the course of seven days with Ban, Elaine's heart is healed. The distance between them closes, but...