Here is full list of all pre-quests for the main quest "Rescue Fredrico":
Niss Quests:
1. The Mysterious Girl
2. Niss' Danger
3. Devil Pattis
4. The Door God's Trial
5. Light and Dark Twin God
6. The Secret of Barnya Sky City
7. The Promise Under the Sky
Roca Quests:
1. First Test
2. Death of Roca's Father
3. Start off again with Roca
4. Undeserved Roca
5. The Fairy's Revelation
6. Strong Enemy, Frederico!
7. The Promise Under the Sky
Clive Quests:
1. Pirates who turn over a new leaf
2. Strong Enemy, Frederico!
Other quests:
1. Take the High Road
2. Unbelievers
3. Vanished Villager