Bonny:
When you equip a Redemption Bow, you can use both the Pardon and Forgiveness skills, both of which have the power to lift the curse.

Because demand is so high, the Redemption Bow and its 2 skills are sold only once every 24 hours. I hope that doesn't cause you any inconvenience!

Oh, the most important thing: remember that a Redemption Bow will disappear 1 hour after being equipped!