| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.36/5 | 4.70/5 |
| Vol 3-4 | 3.49/5 | 4.73/5 |
| Vol 5-6 | 3.62/5 | 4.80/5 |
| Vol 7-8 | 3.52/5 | 4.71/5 |
| Vol 9-10 | 3.84/5 | 4.80/5 |
| Vol 11-12 | 3.15/5 | 4.74/5 |
| Vol 13-14 | 3.13/5 | 4.68/5 |
| Vol 15-16 | 3.43/5 | 4.73/5 |
| Vol 17-18 | 3.62/5 | 4.75/5 |
| Vol 19-20 | 3.20/5 | 4.70/5 |
| Vol 21-22 | 3.85/5 | 4.78/5 |
| Vol 23-24 | 3.58/5 | 4.74/5 |
| Vol 25-26 | 3.55/5 | 4.78/5 |
| Vol 27-28 | 3.60/5 | 4.77/5 |
| Vol 29-30 | 4.07/5 | 4.80/5 |
| Vol 31-32 | 3.53/5 | 4.71/5 |
| Vol 33-34 | 3.55/5 | 4.71/5 |
| Vol 35-36 | 3.51/5 | 4.77/5 |
| Vol 37 | 4.22/5 | 4.80/5 |
| Overall | 3.53/5 | 4.80/5 |