| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.44/5 | 4.26/5 |
| Vol 3-4 | 3.46/5 | 4.36/5 |
| Vol 5-6 | 3.60/5 | 4.44/5 |
| Vol 7-8 | 3.74/5 | 4.54/5 |
| Vol 9-10 | 3.70/5 | 4.53/5 |
| Vol 11-12 | 3.76/5 | 4.53/5 |
| Vol 13-14 | 3.38/5 | 4.35/5 |
| Vol 15-16 | 3.62/5 | 4.51/5 |
| Vol 17-18 | 3.54/5 | 4.44/5 |
| Vol 19-20 | 3.38/5 | 4.40/5 |
| Vol 21-22 | 3.34/5 | 4.30/5 |
| Vol 23-24 | 3.50/5 | 4.50/5 |
| Vol 25-26 | 3.68/5 | 4.49/5 |
| Vol 27-28 | 3.47/5 | 4.38/5 |
| Vol 29-30 | 3.70/5 | 4.51/5 |
| Vol 31-32 | 3.56/5 | 4.48/5 |
| Vol 33-34 | 3.44/5 | 4.41/5 |
| Vol 35-36 | 3.29/5 | 4.27/5 |
| Vol 37-38 | 3.37/5 | 4.39/5 |
| Vol 39-40 | 3.44/5 | 4.40/5 |
| Vol 41-42 | 3.42/5 | 4.36/5 |
| Vol 43-44 | 3.73/5 | 4.51/5 |
| Vol 45 | 3.67/5 | 4.45/5 |
| Overall | 3.53/5 | 4.54/5 |