| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 3.16/5 | 4.51/5 |
| Vol 3-4 | 3.28/5 | 4.54/5 |
| Vol 5-6 | 3.50/5 | 4.61/5 |
| Vol 7-8 | 3.33/5 | 4.52/5 |
| Vol 9-10 | 3.66/5 | 4.61/5 |
| Vol 11-12 | 2.96/5 | 4.55/5 |
| Vol 13-14 | 2.94/5 | 4.49/5 |
| Vol 15-16 | 3.26/5 | 4.54/5 |
| Vol 17-18 | 3.43/5 | 4.56/5 |
| Vol 19-20 | 3.03/5 | 4.51/5 |
| Vol 21-22 | 3.66/5 | 4.59/5 |
| Vol 23-24 | 3.40/5 | 4.55/5 |
| Vol 25-26 | 3.42/5 | 4.59/5 |
| Vol 27-28 | 3.42/5 | 4.58/5 |
| Vol 29-30 | 3.83/5 | 4.61/5 |
| Vol 31-32 | 3.32/5 | 4.52/5 |
| Vol 33-34 | 3.36/5 | 4.52/5 |
| Vol 35-36 | 3.40/5 | 4.58/5 |
| Vol 37 | 4.03/5 | 4.61/5 |
| Overall | 3.37/5 | 4.61/5 |