Bahamut II: Dragon's Bride - Celia's Diary

Expanded storyline: Celia's diary, play through the events of Celia's past.
Trigger condition: After defeating the minibus and having enough favorability, the game will prompt you to go to Celia's former residence to expand the story.
Completion Rewards:
1. Completing the expansion story will give Celia a lot of ability points.
2. Open hidden mazes for players to challenge.
3. Get Celia's exclusive accessories (already opened for all team members to equip).
4. Open new arena challenges.
5. After defeating the final boss, add a short paragraph to talk about the plot in the future.

Source: Steam Store Description