Successfully complete one of the following tasks to unlock the corresponding group illustration at Valeria's Shop:

Group 2: Clear Chronicle 2 in Chronicles Of The Sword mode and meet the bonus requirements or play 300 battles.
Group 3: Clear Chronicle 4 in Chronicles Of The Sword mode and meet the bonus requirements or play 300 battles.
Group 4: Clear Chronicle 6 in Chronicles Of The Sword mode and meet the bonus requirements or play 400 battles.
Group 5: Clear Chronicle 8 in Chronicles Of The Sword mode and meet the bonus requirements or play 400 battles.