| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.01/5 | 4.76/5 |
| Vol 3-4 | 3.10/5 | 4.72/5 |
| Vol 5-6 | 3.32/5 | 4.86/5 |
| Vol 7-8 | 3.24/5 | 4.79/5 |
| Vol 9-10 | 3.18/5 | 4.78/5 |
| Vol 11-12 | 3.08/5 | 4.74/5 |
| Vol 13-14 | 3.15/5 | 4.84/5 |
| Vol 15-16 | 3.21/5 | 4.86/5 |
| Vol 17-18 | 3.32/5 | 4.86/5 |
| Vol 19-20 | 3.19/5 | 4.80/5 |
| Vol 21-22 | 3.12/5 | 4.79/5 |
| Vol 23-24 | 3.05/5 | 4.69/5 |
| Vol 25-26 | 3.30/5 | 4.85/5 |
| Vol 27-28 | 3.01/5 | 4.69/5 |
| Vol 29-30 | 3.00/5 | 4.69/5 |
| Overall | 3.16/5 | 4.86/5 |