The Main Quest is Quest related to the story.
■ Main Quest
① You can check the chapters that are completed, in progress, and upcoming.
② You can check the progress of each chapter. You can earn 200 Diamonds when you clear a chapter.
③ You can check the details and rewards of the main quest, by chapter.
※ The guide was produced in a separate test environment.
So, It may change depending on the update and development situation.
Thank you for your love and interest in the Devil Book~
Devil Book Team