| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.91/5 | 4.44/5 |
| Vol 3-4 | 3.45/5 | 4.60/5 |
| Vol 5-6 | 3.79/5 | 4.65/5 |
| Vol 7-8 | 3.39/5 | 4.61/5 |
| Vol 9-10 | 3.35/5 | 4.58/5 |
| Vol 11-12 | 3.32/5 | 4.58/5 |
| Vol 13-14 | 3.78/5 | 4.64/5 |
| Vol 15-16 | 3.70/5 | 4.64/5 |
| Vol 17-18 | 3.47/5 | 4.63/5 |
| Vol 19-20 | 3.74/5 | 4.63/5 |
| Vol 21-22 | 3.85/5 | 4.64/5 |
| Vol 23-24 | 3.39/5 | 4.55/5 |
| Vol 25-26 | 3.59/5 | 4.64/5 |
| Vol 27-28 | 3.42/5 | 4.58/5 |
| Vol 29-30 | 3.83/5 | 4.65/5 |
| Vol 31-32 | 3.58/5 | 4.63/5 |
| Vol 33-34 | 3.57/5 | 4.61/5 |
| Overall | 3.53/5 | 4.65/5 |