The ending of the young exorcist was not officially announced, so it could not be determined. However, according to the storyline of the exorcist youth, we can speculate on some possible endings:
Allen and Sebastian killed all the demons together and became heroes. Allen and Sebastian lived a happy life and became inseparable friends.
Allen and Sebastian didn't manage to kill all the demons and eventually broke up. Allen continued to pursue his dream of becoming an outstanding mage. Sebastian left this world to find his soulmate.
Yalen and Sebastian did not manage to kill all the demons, but they encountered some difficulties. They may need to fight constantly to protect the world from the threat of demons.
The ending of the young exorcist could be varied, depending on the author's storyline and direction of development.
The ending of the exorcist boy's manga was not yet determined because the manga was not finished yet. However, according to the current progress, the Exorcist Boy manga would continue to tell the story of the black shadow group and the Holy Knights, and might introduce new characters and plots.
In the latest episode of the Exorcist manga, Sebastian Michaeli, a member of the Dark Shadow Group, has revealed his true identity as a Paladin. He has a special connection with one of the main characters, Aurora Grella. This might lead to more storylines and more complicated developments.
Yes, the Blue Exorcist manga is over. It took readers on an exciting journey and concluded in a way that left a lasting impression. The final chapters brought closure to the characters and their adventures.