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                                    Rebirth: Building the Strongest Party with my Overpowered Harem. - Chapter 7: Flames of Echidna.
                            
                                                            
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                                        Chapter 6: We are not longer weak!
                                
                                                                                        
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                                        Chapter 8: Necromancy
                                
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... as a series of tasks that needed to take place.
If an F rank wanted to increase to an E rank, they would need to complete 15 F-rank tasks in a row, with no misses or failures.
The same went for E ranks to D ranks.
In fact, there have been cases of B-rank parties suddenly getting all the way to S rank. This was due to the fact that there was also a system in place for double ranking.
You needed to complete 25 tasks of the upper rank to get a boost that high.
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