| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.80/5 | 4.86/5 |
| Vol 3-4 | 2.33/5 | 4.59/5 |
| Vol 5-6 | 2.33/5 | 4.74/5 |
| Vol 7-8 | 2.28/5 | 4.83/5 |
| Vol 9-10 | 2.30/5 | 4.81/5 |
| Vol 11-12 | 2.31/5 | 4.70/5 |
| Vol 13-14 | 2.22/5 | 4.76/5 |
| Vol 15-16 | 2.84/5 | 4.87/5 |
| Vol 17-18 | 2.31/5 | 4.80/5 |
| Vol 19-20 | 2.32/5 | 4.77/5 |
| Vol 21-22 | 2.46/5 | 4.83/5 |
| Vol 23-24 | 2.82/5 | 4.87/5 |
| Vol 25-26 | 2.21/5 | 4.65/5 |
| Overall | 2.43/5 | 4.87/5 |