| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.41/5 | 4.44/5 |
| Vol 3-4 | 3.47/5 | 4.47/5 |
| Vol 5-6 | 3.31/5 | 4.35/5 |
| Vol 7-8 | 3.37/5 | 4.39/5 |
| Vol 9-10 | 3.54/5 | 4.43/5 |
| Vol 11-12 | 3.46/5 | 4.39/5 |
| Vol 13-14 | 3.22/5 | 4.26/5 |
| Vol 15-16 | 3.29/5 | 4.45/5 |
| Vol 17-18 | 3.48/5 | 4.57/5 |
| Vol 19-20 | 3.82/5 | 4.57/5 |
| Vol 21-22 | 3.71/5 | 4.59/5 |
| Vol 23-24 | 3.82/5 | 4.59/5 |
| Vol 25-26 | 3.77/5 | 4.60/5 |
| Overall | 3.51/5 | 4.60/5 |