| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.29/5 | 4.54/5 |
| Vol 3-4 | 3.72/5 | 4.55/5 |
| Vol 5-6 | 3.50/5 | 4.57/5 |
| Vol 7-8 | 3.15/5 | 4.49/5 |
| Vol 9-10 | 3.17/5 | 4.50/5 |
| Vol 11-12 | 3.48/5 | 4.47/5 |
| Vol 13-14 | 3.45/5 | 4.52/5 |
| Vol 15-16 | 3.63/5 | 4.57/5 |
| Vol 17-18 | 3.19/5 | 4.44/5 |
| Vol 19-20 | 2.96/5 | 4.50/5 |
| Vol 21-22 | 3.29/5 | 4.49/5 |
| Vol 23-24 | 3.90/5 | 4.55/5 |
| Vol 25-26 | 3.52/5 | 4.47/5 |
| Vol 27 | 3.42/5 | 4.49/5 |
| Overall | 3.41/5 | 4.57/5 |