| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 4.02/5 | 4.61/5 |
| Vol 3-4 | 3.57/5 | 4.66/5 |
| Vol 5-6 | 4.13/5 | 4.65/5 |
| Vol 7-8 | 3.53/5 | 4.65/5 |
| Vol 9-10 | 3.62/5 | 4.60/5 |
| Vol 11-12 | 3.64/5 | 4.60/5 |
| Vol 13-14 | 3.33/5 | 4.56/5 |
| Vol 15-16 | 3.49/5 | 4.58/5 |
| Vol 17-18 | 3.44/5 | 4.61/5 |
| Vol 19-20 | 4.07/5 | 4.63/5 |
| Vol 21-22 | 3.74/5 | 4.61/5 |
| Vol 23-24 | 3.78/5 | 4.65/5 |
| Vol 25-26 | 4.11/5 | 4.66/5 |
| Vol 27-28 | 4.08/5 | 4.64/5 |
| Vol 29-30 | 3.95/5 | 4.61/5 |
| Vol 31-32 | 2.99/5 | 4.53/5 |
| Vol 33-34 | 3.97/5 | 4.63/5 |
| Vol 35-36 | 3.94/5 | 4.61/5 |
| Vol 37-38 | 3.99/5 | 4.59/5 |
| Overall | 3.74/5 | 4.66/5 |