Bleach, Nurarihyon no Mago: Sennen Makyou Recommendations
Nurarihyon's Hagoromo Gitsune arc is eerily similar to Bleach's Soul Society arc. It starts with the a character getting kidnapped, the main character is forced to train in preparation of the inevitable invasion they need to do to get said character back. The invasion fails in case of the entrance so they need to improvise another plan to enter. With them traveling to retrieve their friend they get stronger in the process. The main character has to fight an enemy that only wishes to fight the stongest. At the end a character pulls an "Aizen" and all hell breaks loose.