| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.82/5 | 4.32/5 |
| Vol 3-4 | 3.28/5 | 4.53/5 |
| Vol 5-6 | 3.57/5 | 4.52/5 |
| Vol 7-8 | 3.23/5 | 4.46/5 |
| Vol 9-10 | 3.90/5 | 4.59/5 |
| Vol 11-12 | 3.63/5 | 4.54/5 |
| Vol 13-14 | 3.69/5 | 4.59/5 |
| Vol 15-16 | 3.74/5 | 4.63/5 |
| Vol 17-18 | 3.53/5 | 4.57/5 |
| Vol 19-20 | 3.07/5 | 4.47/5 |
| Vol 21-22 | 4.13/5 | 4.65/5 |
| Vol 23-24 | 3.65/5 | 4.59/5 |
| Vol 25-26 | 3.55/5 | 4.51/5 |
| Vol 27-28 | 3.70/5 | 4.57/5 |
| Vol 29-30 | 3.91/5 | 4.61/5 |
| Vol 31-32 | 3.91/5 | 4.61/5 |
| Vol 33-34 | 4.16/5 | 4.68/5 |
| Overall | 3.61/5 | 4.68/5 |