| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.38/5 | 4.33/5 |
| Vol 3-4 | 3.34/5 | 4.33/5 |
| Vol 5-6 | 3.35/5 | 4.32/5 |
| Vol 7-8 | 3.36/5 | 4.46/5 |
| Vol 9-10 | 3.52/5 | 4.43/5 |
| Vol 11-12 | 3.24/5 | 4.31/5 |
| Vol 13-14 | 2.82/5 | 4.19/5 |
| Vol 15-16 | 3.36/5 | 4.40/5 |
| Vol 17-18 | 2.96/5 | 4.34/5 |
| Vol 19-20 | 3.04/5 | 4.38/5 |
| Vol 21-22 | 3.14/5 | 4.31/5 |
| Vol 23-24 | 3.20/5 | 4.25/5 |
| Vol 25-26 | 3.27/5 | 4.24/5 |
| Vol 27-28 | 3.37/5 | 4.42/5 |
| Vol 29-30 | 3.21/5 | 4.32/5 |
| Vol 31-32 | 3.50/5 | 4.47/5 |
| Overall | 3.25/5 | 4.47/5 |