| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-3 | 3.80/5 | 4.63/5 |
| Vol 4-6 | 3.42/5 | 4.57/5 |
| Vol 7-9 | 3.91/5 | 4.60/5 |
| Vol 10-12 | 4.01/5 | 4.62/5 |
| Vol 13-15 | 3.93/5 | 4.62/5 |
| Vol 16-18 | 4.05/5 | 4.65/5 |
| Vol 19-21 | 3.95/5 | 4.64/5 |
| Vol 22-24 | 3.87/5 | 4.68/5 |
| Vol 25-27 | 4.02/5 | 4.63/5 |
| Vol 28-30 | 4.01/5 | 4.64/5 |
| Vol 31-33 | 4.04/5 | 4.66/5 |
| Vol 34-36 | 3.81/5 | 4.60/5 |
| Vol 37-39 | 3.86/5 | 4.58/5 |
| Vol 40-42 | 4.12/5 | 4.67/5 |
| Vol 43-45 | 4.09/5 | 4.66/5 |
| Vol 46-48 | 3.73/5 | 4.59/5 |
| Vol 49-51 | 4.07/5 | 4.63/5 |
| Vol 52-54 | 3.99/5 | 4.62/5 |
| Vol 55-56 | 3.98/5 | 4.66/5 |
| Overall | 3.93/5 | 4.68/5 |