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When you arrive Crystal Garden, talk to Alfred to turn in the quest.
He will ask you to defeat 30 Orange Mushroom from Crystal Garden, do it and turn it in to him.
Talk to him and you will get the EXP potion which makes you Level 18.
Then he will ask you to defeat 50 Stumpies, finish it and turn it in to Alfred.
Talk to Mao and she will ask you to go to Lith Harbour and find Tru.
Then he will ask you to find Francis in Golem Temple.
Defeat him and talk to him to complete the quest, and then you have to defeat him the second time.
After that, he request for 50 stones from any golems.
Turn that in and defeat him for the third time, then he ask for 70 stones from any golems again.
After that, find Tru and head back to Christine from Crystal Garden.
Tru will give you a quest and if you accept it, he will transport you to Rien, filled with Black Wings rabbits.
Defeat every single one of them and go to the left portal and find Lirin to finish the quest.
Go back to Mao to turn the quest in.
Go to Helios Tower and find the Librarian.
Then go to the portal at top-right and kill all the rabbits again.
After that go and kill the Librarian (possessed by Sue).
Go back to Crystal Garden and report in to Mao (and receive a cane!).
Go to Sleepywood and talk to The Rememberer.
He will ask you to hunt 50 ETCs from Tauromacis.
Once that is done, he will give you a special charm.
Go to the place before Ant Tunnel and click the statue.
Now, you need to fight with Sue, which is possessed by the guy with the katana (forgot the name FUUUUUU).
Lastly, return to Crystal Garden and report in (and receive a cane!).
Level 74 - Ending
Go to Edelstein Power Station and find Sue.
Then talk, talk, talk, bla bla bla, and you're done and transported to Ereb.
BTW, once you complete the story you will get the Alliance skill and medal!
Level 100 - Bonus
Receive a quest from yourself and talk to Alfred in Crystal Garden.
Go to Magatia and find Bedin, he will need 10 million mesos.
After that, you will get your own mount skill (The Luxury Car).
Hope these helped. :doit:
Some info used from the source here: