Enter Ariela's Tavern. Go upstairs and you will hear the man in green talk about a guy in blue looking for a master of archery. Talk to him and say that "I'm interested". He will tell you that the guy is in Fountain Plaza. Move on to Fountain Plaza, talk to the man in blue in a corner. He will tell you to fire an arrow through a certain person's heart. Accept his quest. He tells you to fire the Charm Arrow into the girl with the pale blue dress. Zael will compliment if you succeeded.
Reward: 2+ Arrow Damage
This quest can be repeated until Chapter 31. (You have to enter in and out of an area before you can do it again).