| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.24/5 | 4.05/5 |
| Vol 3-4 | 3.24/5 | 3.92/5 |
| Vol 5-6 | 3.34/5 | 3.98/5 |
| Vol 7-8 | 3.26/5 | 3.96/5 |
| Vol 9-10 | 3.43/5 | 4.26/5 |
| Vol 11-12 | 3.50/5 | 4.27/5 |
| Vol 13-14 | 3.46/5 | 4.34/5 |
| Vol 15-16 | 3.45/5 | 4.28/5 |
| Vol 17-18 | 3.50/5 | 4.30/5 |
| Vol 19-20 | 3.52/5 | 4.39/5 |
| Vol 21-22 | 3.59/5 | 4.42/5 |
| Vol 23-24 | 3.54/5 | 4.29/5 |
| Vol 25-26 | 3.60/5 | 4.44/5 |
| Vol 27-28 | 3.63/5 | 4.42/5 |
| Vol 29-30 | 3.40/5 | 4.13/5 |
| Overall | 3.45/5 | 4.44/5 |