| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.84/5 | 4.49/5 |
| Vol 3-4 | 3.34/5 | 4.52/5 |
| Vol 5-6 | 3.05/5 | 4.48/5 |
| Vol 7-8 | 3.06/5 | 4.48/5 |
| Vol 9-10 | 3.19/5 | 4.49/5 |
| Vol 11-12 | 3.34/5 | 4.55/5 |
| Vol 13-14 | 3.16/5 | 4.52/5 |
| Vol 15-16 | 3.17/5 | 4.50/5 |
| Vol 17-18 | 3.52/5 | 4.55/5 |
| Vol 19-20 | 3.36/5 | 4.52/5 |
| Vol 21-22 | 3.42/5 | 4.55/5 |
| Vol 23-24 | 3.50/5 | 4.55/5 |
| Vol 25-26 | 2.97/5 | 4.47/5 |
| Vol 27-28 | 2.84/5 | 4.43/5 |
| Vol 29-30 | 3.14/5 | 4.57/5 |
| Vol 31-32 | 3.22/5 | 4.54/5 |
| Vol 33-34 | 3.76/5 | 4.63/5 |
| Overall | 3.23/5 | 4.63/5 |