| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.49/5 | 4.36/5 |
| Vol 3-4 | 2.57/5 | 4.28/5 |
| Vol 5-6 | 2.69/5 | 4.40/5 |
| Vol 7-8 | 3.01/5 | 4.43/5 |
| Vol 9-10 | 2.82/5 | 4.41/5 |
| Vol 11-12 | 3.96/5 | 4.55/5 |
| Vol 13-14 | 3.41/5 | 4.50/5 |
| Vol 15-16 | 3.33/5 | 4.47/5 |
| Vol 17-18 | 3.72/5 | 4.52/5 |
| Vol 19-20 | 3.63/5 | 4.52/5 |
| Vol 21-22 | 3.95/5 | 4.57/5 |
| Vol 23-24 | 3.59/5 | 4.55/5 |
| Vol 25-26 | 4.03/5 | 4.59/5 |
| Vol 27-28 | 4.13/5 | 4.62/5 |
| Vol 29-30 | 4.13/5 | 4.63/5 |
| Vol 31-32 | 3.81/5 | 4.54/5 |
| Vol 33-34 | 3.95/5 | 4.55/5 |
| Vol 35-36 | 4.07/5 | 4.61/5 |
| Vol 37-38 | 4.14/5 | 4.63/5 |
| Overall | 3.47/5 | 4.63/5 |