| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.01/5 | 4.39/5 |
| Vol 3-4 | 2.96/5 | 4.41/5 |
| Vol 5-6 | 3.00/5 | 4.44/5 |
| Vol 7-8 | 3.11/5 | 4.43/5 |
| Vol 9-10 | 3.13/5 | 4.45/5 |
| Vol 11-12 | 3.06/5 | 4.55/5 |
| Vol 13-14 | 3.26/5 | 4.47/5 |
| Vol 15-16 | 3.02/5 | 4.42/5 |
| Vol 17-18 | 3.19/5 | 4.50/5 |
| Vol 19-20 | 3.05/5 | 4.43/5 |
| Vol 21-22 | 3.04/5 | 4.47/5 |
| Vol 23-24 | 3.12/5 | 4.44/5 |
| Vol 25-26 | 3.42/5 | 4.55/5 |
| Vol 27-28 | 3.34/5 | 4.54/5 |
| Overall | 3.12/5 | 4.55/5 |