| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 4.36/5 | 4.72/5 |
| Vol 3-4 | 4.32/5 | 4.72/5 |
| Vol 5-6 | 4.27/5 | 4.69/5 |
| Vol 7-8 | 4.31/5 | 4.70/5 |
| Vol 9-10 | 4.32/5 | 4.71/5 |
| Vol 11-12 | 4.35/5 | 4.73/5 |
| Vol 13-14 | 4.32/5 | 4.71/5 |
| Vol 15-16 | 4.36/5 | 4.72/5 |
| Vol 17-18 | 4.26/5 | 4.69/5 |
| Vol 19-20 | 4.33/5 | 4.71/5 |
| Vol 21-22 | 4.34/5 | 4.71/5 |
| Vol 23-24 | 4.32/5 | 4.71/5 |
| Vol 25-26 | 4.30/5 | 4.70/5 |
| Vol 27-28 | 4.29/5 | 4.70/5 |
| Vol 29-30 | 4.27/5 | 4.69/5 |
| Vol 31 | 4.24/5 | 4.67/5 |
| Overall | 4.32/5 | 4.73/5 |