| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.84/5 | 4.33/5 |
| Vol 3-4 | 3.30/5 | 4.54/5 |
| Vol 5-6 | 3.58/5 | 4.53/5 |
| Vol 7-8 | 3.26/5 | 4.47/5 |
| Vol 9-10 | 3.90/5 | 4.60/5 |
| Vol 11-12 | 3.64/5 | 4.55/5 |
| Vol 13-14 | 3.68/5 | 4.60/5 |
| Vol 15-16 | 3.72/5 | 4.64/5 |
| Vol 17-18 | 3.52/5 | 4.58/5 |
| Vol 19-20 | 3.08/5 | 4.48/5 |
| Vol 21-22 | 4.14/5 | 4.66/5 |
| Vol 23-24 | 3.71/5 | 4.60/5 |
| Vol 25-26 | 3.56/5 | 4.52/5 |
| Vol 27-28 | 3.71/5 | 4.58/5 |
| Vol 29-30 | 3.94/5 | 4.62/5 |
| Vol 31-32 | 3.92/5 | 4.62/5 |
| Vol 33-34 | 4.16/5 | 4.69/5 |
| Overall | 3.63/5 | 4.69/5 |