The "Chapter 7 grind" is a common hurdle. Steam Community discussions suggest a much faster method than manual exploration:

For (Update v20210407), the most effective strategies focus on optimizing your V-Cube builds and exploiting the specific strengths of the Goddesses. ⚔️ Character Tier & Combat Tips

A standard playthrough takes about 15–20 hours . Completionists should expect around 26 hours.