| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.67/5 | 4.58/5 |
| Vol 3-4 | 2.49/5 | 4.59/5 |
| Vol 5-6 | 3.10/5 | 4.63/5 |
| Vol 7-8 | 3.54/5 | 4.70/5 |
| Vol 9-10 | 3.75/5 | 4.73/5 |
| Vol 11-12 | 3.35/5 | 4.71/5 |
| Vol 13-14 | 3.36/5 | 4.69/5 |
| Vol 15-16 | 3.44/5 | 4.77/5 |
| Vol 17-18 | 3.84/5 | 4.76/5 |
| Vol 19-20 | 3.85/5 | 4.76/5 |
| Vol 21-22 | 3.63/5 | 4.77/5 |
| Vol 23-24 | 3.66/5 | 4.76/5 |
| Vol 25-26 | 3.14/5 | 4.65/5 |
| Vol 27-28 | 3.57/5 | 4.81/5 |
| Vol 29-30 | 2.84/5 | 4.57/5 |
| Vol 31-32 | 3.56/5 | 4.77/5 |
| Vol 33 | 3.34/5 | 4.64/5 |
| Overall | 3.38/5 | 4.81/5 |