| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.81/5 | 4.42/5 |
| Vol 3-4 | 3.03/5 | 4.50/5 |
| Vol 5-6 | 2.95/5 | 4.59/5 |
| Vol 7-8 | 2.88/5 | 4.48/5 |
| Vol 9-10 | 2.80/5 | 4.54/5 |
| Vol 11-12 | 2.78/5 | 4.42/5 |
| Vol 13-14 | 2.73/5 | 4.24/5 |
| Vol 15-16 | 2.71/5 | 4.11/5 |
| Vol 17-18 | 2.70/5 | 4.46/5 |
| Vol 19-20 | 2.96/5 | 4.65/5 |
| Vol 21-22 | 2.60/5 | 4.38/5 |
| Vol 23-24 | 2.64/5 | 4.24/5 |
| Vol 25-26 | 2.69/5 | 4.21/5 |
| Overall | 2.79/5 | 4.65/5 |