| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.51/5 | 4.57/5 |
| Vol 3-4 | 2.82/5 | 4.79/5 |
| Vol 5-6 | 2.92/5 | 4.65/5 |
| Vol 7-8 | 2.91/5 | 4.70/5 |
| Vol 9-10 | 2.85/5 | 4.61/5 |
| Vol 11-12 | 2.97/5 | 4.67/5 |
| Vol 13-14 | 3.52/5 | 4.89/5 |
| Vol 15-16 | 3.05/5 | 4.89/5 |
| Vol 17-18 | 2.63/5 | 4.56/5 |
| Vol 19-20 | 2.73/5 | 4.56/5 |
| Vol 21-22 | 2.75/5 | 4.58/5 |
| Vol 23-24 | 3.02/5 | 4.74/5 |
| Vol 25-26 | 2.89/5 | 4.66/5 |
| Vol 27-28 | 3.11/5 | 4.79/5 |
| Vol 29-30 | 2.60/5 | 4.56/5 |
| Vol 31-32 | 2.45/5 | 4.44/5 |
| Vol 33-34 | 2.13/5 | 4.38/5 |
| Overall | 2.83/5 | 4.89/5 |