There is a Temple of Light inside the Holy City. Enter the Temple and meet the Priest of Light (If you've included Charlotte in your team, she'll not enter the Temple).The dialog between you and the Priest will depend on your choice of character. For me (Duran), the Priest will talk about the Mana Sword under the Mana Tree. Duran is very happy, hoping that he'll defeat the Scarlet Magician using this Sword.
In the middle, the fairy will come out. She asks the Priest the way to save the Mana Tree, since it's withering. The Priest also feels that the Power of Mana is falling. He'll tell you to release the Eight Spirits on the Earth, and they'll open the Gate to the Sanctuary. The first one, the Light Spirit, is just inside the cave you've just passed.
The Spirit of Light
If you've included Charlotte in your squad, she'll join you again after you come out of the Temple. Otherwise she'll stay at the entrance of the cave. She'll demand you to bring her to the cave. "I'm already 16. I'm not a child anymore." You turn down her request, and she's very angry.
At the place you met Charlotte, the fairy will come out. She flies around, and sees the place where Charlotte falls down. "I can feel the Spirit here. Let's go!". You go to there, and a special menu appears. Choose the fairy, and she'll use magic to let you pass the huge gap.
The enemies inside the cave are now Level 4 ones, so it's the best time to earn experience points. Refresh yourself under the Mana Statue. At the end of the cave, you'll meet the first boss - A giant spider. It's quite easy to defeat it, but do watch out your HP.
After that, the Spirit of Light appears, and it'll join you. After that, you find a shortcut. You go to the shortcut and go back. You'll reach the gap again. Pass it by using fairy.
Suddenly, the Beast Army appears and attacks you. "We've finally find the way to the Holy City. Let's move!" says Rugar. Your squad falls down the waterfall, and is unconcious for a while.
Then the scene changes. The Mana Sactuary appears. Four fairies gather near the Mana Tree, around the Mana Sword. "The Tree is withering." says one fairy, "What should we do?".
"Let's talk to the Priest of Light!" another fairy says. So they all
starts their journey. The journey is too long for them. Three fairies
give up at different times. At last only one fairy can make it. (This
scene resembles the opening of the game)
The Great Escape
When you wake up, you find yourself trapped inside a prison. "Hey! Let me go!" you shouted, but no one helps you.
"Yo, can you please shut up?" the one in the neighboring cell says. He's/She's the third character in your squad. "What's up here?" a beast soldier enters. Your third character will try to get out of the cell. He/She succeeds (the method depends on your choice of character), and opens the door of your cell. "You wanna get out of here, right? Get out of this castle and go to the pier. The captain of the ship will sail us to Maia, the Free City."
Refresh yourself under the Mana Statue, and prepare for your great escape. There's no boss here, so don't be afraid. The castle is actually located in Jado. Go to the pier and board on the ship. During the voyage your third character will tell about his/her story (a "pilot episode" again). After that, you'll arrive at Maia.
That's all this time, folks