| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.78/5 | 4.46/5 |
| Vol 3-4 | 3.03/5 | 4.68/5 |
| Vol 5-6 | 2.89/5 | 4.64/5 |
| Vol 7-8 | 2.92/5 | 4.67/5 |
| Vol 9-10 | 2.98/5 | 4.68/5 |
| Vol 11-12 | 2.75/5 | 4.64/5 |
| Vol 13-14 | 2.90/5 | 4.62/5 |
| Vol 15-16 | 3.07/5 | 4.71/5 |
| Vol 17-18 | 3.22/5 | 4.70/5 |
| Vol 19-20 | 2.95/5 | 4.66/5 |
| Vol 21-22 | 2.96/5 | 4.67/5 |
| Vol 23-24 | 3.15/5 | 4.73/5 |
| Vol 25-26 | 2.97/5 | 4.63/5 |
| Vol 27-28 | 2.92/5 | 4.62/5 |
| Vol 29-30 | 3.09/5 | 4.70/5 |
| Overall | 2.98/5 | 4.73/5 |