| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.16/5 | 3.96/5 |
| Vol 3-4 | 3.22/5 | 3.96/5 |
| Vol 5-6 | 3.34/5 | 4.10/5 |
| Vol 7-8 | 3.36/5 | 4.08/5 |
| Vol 9-10 | 3.52/5 | 4.32/5 |
| Vol 11-12 | 3.46/5 | 4.24/5 |
| Vol 13-14 | 3.54/5 | 4.33/5 |
| Vol 15-16 | 3.44/5 | 4.33/5 |
| Vol 17-18 | 3.56/5 | 4.39/5 |
| Vol 19-20 | 3.52/5 | 4.34/5 |
| Vol 21-22 | 3.58/5 | 4.44/5 |
| Vol 23-24 | 3.46/5 | 4.17/5 |
| Vol 25-26 | 3.62/5 | 4.40/5 |
| Vol 27-28 | 3.66/5 | 4.47/5 |
| Vol 29-30 | 3.38/5 | 4.14/5 |
| Overall | 3.45/5 | 4.47/5 |