| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.43/5 | 4.60/5 |
| Vol 3-4 | 3.22/5 | 4.58/5 |
| Vol 5-6 | 3.44/5 | 4.62/5 |
| Vol 7-8 | 3.43/5 | 4.54/5 |
| Vol 9-10 | 3.89/5 | 4.62/5 |
| Vol 11-12 | 3.65/5 | 4.58/5 |
| Vol 13-14 | 3.48/5 | 4.61/5 |
| Vol 15-16 | 2.93/5 | 4.52/5 |
| Vol 17-18 | 2.69/5 | 4.39/5 |
| Vol 19-20 | 3.17/5 | 4.53/5 |
| Vol 21-22 | 2.92/5 | 4.52/5 |
| Vol 23-24 | 3.09/5 | 4.58/5 |
| Vol 25-26 | 3.12/5 | 4.54/5 |
| Vol 27-28 | 3.23/5 | 4.58/5 |
| Vol 29-30 | 2.93/5 | 4.49/5 |
| Vol 31-32 | 2.79/5 | 4.48/5 |
| Vol 33-34 | 2.91/5 | 4.53/5 |
| Vol 35-36 | 3.11/5 | 4.53/5 |
| Vol 37-38 | 3.16/5 | 4.55/5 |
| Vol 39-40 | 2.88/5 | 4.55/5 |
| Vol 41-42 | 2.59/5 | 4.43/5 |
| Vol 43-44 | 3.57/5 | 4.61/5 |
| Vol 45-46 | 3.17/5 | 4.52/5 |
| Vol 47-48 | 3.50/5 | 4.61/5 |
| Vol 49 | 3.86/5 | 4.58/5 |
| Overall | 3.18/5 | 4.62/5 |