| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.80/5 | 4.44/5 |
| Vol 3-4 | 2.80/5 | 4.47/5 |
| Vol 5-6 | 3.36/5 | 4.54/5 |
| Vol 7-8 | 2.78/5 | 4.36/5 |
| Vol 9-10 | 3.16/5 | 4.55/5 |
| Vol 11-12 | 2.80/5 | 4.44/5 |
| Vol 13-14 | 2.74/5 | 4.32/5 |
| Vol 15-16 | 2.82/5 | 4.41/5 |
| Vol 17-18 | 2.76/5 | 4.35/5 |
| Vol 19-20 | 2.80/5 | 4.39/5 |
| Vol 21-22 | 3.55/5 | 4.58/5 |
| Vol 23-24 | 2.90/5 | 4.40/5 |
| Vol 25-26 | 3.30/5 | 4.54/5 |
| Vol 27-28 | 3.07/5 | 4.49/5 |
| Vol 29-30 | 2.96/5 | 4.52/5 |
| Vol 31-32 | 3.10/5 | 4.49/5 |
| Vol 33-34 | 3.20/5 | 4.56/5 |
| Vol 35-36 | 2.92/5 | 4.43/5 |
| Vol 37-38 | 3.35/5 | 4.54/5 |
| Vol 39-40 | 3.31/5 | 4.58/5 |
| Vol 41-42 | 3.44/5 | 4.57/5 |
| Vol 43 | 2.69/5 | 4.43/5 |
| Overall | 3.03/5 | 4.58/5 |