| Progress | Difficulty | Peak |
|---|---|---|
| Vol 1-2 | 2.08/5 | 4.14/5 |
| Vol 3-4 | 1.96/5 | 3.78/5 |
| Vol 5-6 | 1.81/5 | 2.93/5 |
| Vol 7-8 | 1.72/5 | 2.91/5 |
| Vol 9-10 | 1.99/5 | 3.13/5 |
| Vol 11-12 | 2.02/5 | 3.67/5 |
| Vol 13-14 | 1.96/5 | 4.03/5 |
| Vol 15-16 | 2.06/5 | 3.50/5 |
| Vol 17-18 | 1.95/5 | 4.14/5 |
| Vol 19-20 | 2.18/5 | 4.09/5 |
| Vol 21-22 | 2.20/5 | 3.78/5 |
| Vol 23-24 | 1.94/5 | 4.00/5 |
| Vol 25-26 | 2.16/5 | 4.23/5 |
| Vol 27-28 | 2.38/5 | 4.23/5 |
| Overall | 2.03/5 | 4.23/5 |