| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.97/5 | 4.62/5 |
| Vol 3-4 | 3.86/5 | 4.62/5 |
| Vol 5-6 | 3.06/5 | 4.59/5 |
| Vol 7-8 | 4.06/5 | 4.64/5 |
| Vol 9-10 | 3.78/5 | 4.62/5 |
| Vol 11-12 | 3.86/5 | 4.62/5 |
| Vol 13-14 | 4.06/5 | 4.65/5 |
| Vol 15-16 | 2.78/5 | 4.55/5 |
| Vol 17-18 | 4.06/5 | 4.63/5 |
| Vol 19-20 | 4.12/5 | 4.66/5 |
| Vol 21-22 | 4.17/5 | 4.68/5 |
| Vol 23-24 | 3.40/5 | 4.61/5 |
| Vol 25-26 | 3.15/5 | 4.59/5 |
| Vol 27-28 | 4.13/5 | 4.70/5 |
| Vol 29-30 | 3.82/5 | 4.61/5 |
| Vol 31-32 | 3.39/5 | 4.64/5 |
| Vol 33-34 | 3.38/5 | 4.63/5 |
| Vol 35 | 4.08/5 | 4.63/5 |
| Overall | 3.72/5 | 4.70/5 |