| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.64/5 | 4.81/5 |
| Vol 3-4 | 3.43/5 | 4.79/5 |
| Vol 5-6 | 3.65/5 | 4.83/5 |
| Vol 7-8 | 3.64/5 | 4.75/5 |
| Vol 9-10 | 4.10/5 | 4.83/5 |
| Vol 11-12 | 3.86/5 | 4.79/5 |
| Vol 13-14 | 3.69/5 | 4.82/5 |
| Vol 15-16 | 3.14/5 | 4.73/5 |
| Vol 17-18 | 2.90/5 | 4.60/5 |
| Vol 19-20 | 3.38/5 | 4.74/5 |
| Vol 21-22 | 3.13/5 | 4.73/5 |
| Vol 23-24 | 3.30/5 | 4.79/5 |
| Vol 25-26 | 3.33/5 | 4.75/5 |
| Vol 27-28 | 3.44/5 | 4.79/5 |
| Vol 29-30 | 3.14/5 | 4.70/5 |
| Vol 31-32 | 3.00/5 | 4.69/5 |
| Vol 33-34 | 3.12/5 | 4.74/5 |
| Vol 35-36 | 3.32/5 | 4.74/5 |
| Vol 37-38 | 3.37/5 | 4.76/5 |
| Vol 39-40 | 3.09/5 | 4.76/5 |
| Vol 41-42 | 2.80/5 | 4.64/5 |
| Vol 43-44 | 3.78/5 | 4.82/5 |
| Vol 45-46 | 3.38/5 | 4.73/5 |
| Vol 47-48 | 3.71/5 | 4.82/5 |
| Vol 49 | 4.07/5 | 4.79/5 |
| Overall | 3.39/5 | 4.83/5 |