| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.67/5 | 4.49/5 |
| Vol 3-4 | 3.74/5 | 4.55/5 |
| Vol 5-6 | 3.59/5 | 4.45/5 |
| Vol 7-8 | 3.65/5 | 4.46/5 |
| Vol 9-10 | 3.95/5 | 4.63/5 |
| Vol 11-12 | 3.79/5 | 4.52/5 |
| Vol 13-14 | 3.82/5 | 4.56/5 |
| Vol 15-16 | 3.82/5 | 4.56/5 |
| Vol 17-18 | 3.76/5 | 4.58/5 |
| Vol 19-20 | 3.84/5 | 4.56/5 |
| Vol 21-22 | 3.90/5 | 4.59/5 |
| Vol 23-24 | 3.84/5 | 4.56/5 |
| Vol 25-26 | 4.01/5 | 4.61/5 |
| Vol 27-28 | 4.05/5 | 4.65/5 |
| Overall | 3.82/5 | 4.65/5 |