You can naturally understand the whole story through quests.
And various rewards and character cards can be obtained every time you clear the Recruitment quests.

[8] Granma and Fritz

Quest information
Start NPC Granma
zone Ustiur, Base Camp
Objective Go visit Granma
Basic rewards 3 pcs Epic Grade Glaziums
Item rewards Health-Filler, Progressive Soul-Filler
Quest walkthrough

After completing the City of Auch Pioneering Quest, you will be ask to go to Ustiur Base Camp

In order to go to Ustiur Base Camp, you have to go to Port of Coimbra and find the Ticket Agent
After you find the Ticket Agent, you have to buy a ticket (free pass) to Ustiur worth 40,000 Vis

Note: Only Family member Level 75 and above can only go to Ustiur Base Camp through Pinta, if one of your family member that were logged in does not have the level requirement, you will not be able to travel to Ustiur. We advise to use family members above level 75.
Talk to Granma and select “Granma and Fritz”

Go to a different map or log out or change channel to trigger the next quest.

Talk to Granma after receiving a letter from her. She says Fritz seems to go to Bahama which is located near Ustiur and you should meet Lyndon in Reboldoeux.
Rewards: 3 pcs Epic Grade Glaziums, Health-Filler, Progressive Soul-Filler