| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.29/5 | 4.75/5 |
| Vol 3-4 | 3.69/5 | 4.76/5 |
| Vol 5-6 | 3.23/5 | 4.68/5 |
| Vol 7-8 | 3.16/5 | 4.71/5 |
| Vol 9-10 | 3.28/5 | 4.73/5 |
| Vol 11-12 | 3.14/5 | 4.66/5 |
| Vol 13-14 | 2.92/5 | 4.60/5 |
| Vol 15-16 | 3.39/5 | 4.71/5 |
| Vol 17-18 | 3.12/5 | 4.68/5 |
| Vol 19-20 | 3.17/5 | 4.67/5 |
| Vol 21-22 | 3.02/5 | 4.63/5 |
| Vol 23-24 | 3.19/5 | 4.68/5 |
| Vol 25-26 | 2.93/5 | 4.60/5 |
| Vol 27-28 | 3.23/5 | 4.62/5 |
| Vol 29-30 | 3.38/5 | 4.68/5 |
| Vol 31-32 | 2.95/5 | 4.66/5 |
| Vol 33 | 3.03/5 | 4.63/5 |
| Overall | 3.18/5 | 4.76/5 |