| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.19/5 | 4.63/5 |
| Vol 3-4 | 3.22/5 | 4.59/5 |
| Vol 5-6 | 3.48/5 | 4.67/5 |
| Vol 7-8 | 3.28/5 | 4.64/5 |
| Vol 9-10 | 3.03/5 | 4.66/5 |
| Vol 11-12 | 4.14/5 | 4.72/5 |
| Vol 13-14 | 3.51/5 | 4.69/5 |
| Vol 15-16 | 3.43/5 | 4.62/5 |
| Vol 17-18 | 4.03/5 | 4.76/5 |
| Vol 19-20 | 3.87/5 | 4.69/5 |
| Vol 21-22 | 4.14/5 | 4.73/5 |
| Vol 23-24 | 4.03/5 | 4.69/5 |
| Vol 25-26 | 4.21/5 | 4.74/5 |
| Vol 27-28 | 3.77/5 | 4.77/5 |
| Vol 29-30 | 3.69/5 | 4.67/5 |
| Vol 31-32 | 3.58/5 | 4.65/5 |
| Vol 33-34 | 3.80/5 | 4.70/5 |
| Vol 35-36 | 3.69/5 | 4.69/5 |
| Vol 37-38 | 3.35/5 | 4.68/5 |
| Overall | 3.65/5 | 4.77/5 |