| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.86/5 | 4.28/5 |
| Vol 3-4 | 2.82/5 | 4.31/5 |
| Vol 5-6 | 2.92/5 | 4.28/5 |
| Vol 7-8 | 2.98/5 | 4.46/5 |
| Vol 9-10 | 2.85/5 | 4.52/5 |
| Vol 11-12 | 2.91/5 | 4.35/5 |
| Vol 13-14 | 2.84/5 | 4.37/5 |
| Vol 15-16 | 2.69/5 | 4.03/5 |
| Vol 17-18 | 2.81/5 | 4.03/5 |
| Vol 19-20 | 2.78/5 | 4.08/5 |
| Vol 21-22 | 2.91/5 | 4.52/5 |
| Vol 23-24 | 2.88/5 | 4.47/5 |
| Vol 25-26 | 3.01/5 | 4.52/5 |
| Vol 27-28 | 2.94/5 | 4.33/5 |
| Vol 29-30 | 3.02/5 | 4.52/5 |
| Vol 31 | 2.99/5 | 4.20/5 |
| Overall | 2.89/5 | 4.52/5 |