| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.48/5 | 4.25/5 |
| Vol 3-4 | 2.38/5 | 4.32/5 |
| Vol 5-6 | 2.60/5 | 4.33/5 |
| Vol 7-8 | 2.32/5 | 4.21/5 |
| Vol 9-10 | 2.36/5 | 4.06/5 |
| Vol 11-12 | 2.18/5 | 4.00/5 |
| Vol 13-14 | 2.10/5 | 4.09/5 |
| Vol 15-16 | 2.16/5 | 4.09/5 |
| Vol 17-18 | 2.25/5 | 4.25/5 |
| Vol 19-20 | 2.41/5 | 4.19/5 |
| Vol 21-22 | 2.16/5 | 4.09/5 |
| Vol 23-24 | 2.06/5 | 4.09/5 |
| Vol 25-26 | 2.70/5 | 4.39/5 |
| Overall | 2.32/5 | 4.39/5 |