| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.01/5 | 4.66/5 |
| Vol 3-4 | 3.04/5 | 4.68/5 |
| Vol 5-6 | 2.94/5 | 4.59/5 |
| Vol 7-8 | 2.81/5 | 4.55/5 |
| Vol 9-10 | 3.00/5 | 4.60/5 |
| Vol 11-12 | 3.06/5 | 4.61/5 |
| Vol 13-14 | 2.87/5 | 4.68/5 |
| Vol 15-16 | 2.79/5 | 4.40/5 |
| Vol 17-18 | 2.69/5 | 4.44/5 |
| Vol 19-20 | 2.71/5 | 4.22/5 |
| Vol 21-22 | 2.91/5 | 4.48/5 |
| Vol 23-24 | 2.80/5 | 4.54/5 |
| Vol 25-26 | 3.01/5 | 4.66/5 |
| Overall | 2.89/5 | 4.68/5 |