Koushakuka no S-Rank Jingi Tsukai no Kaiki

There exists weapons known as “Divine arms” that are the manifestation of one’s own soul. Our protagonist Bell was born in a famous Paladin family, but is the only member unable to manifest a divine armament and gets banished. But then he inherits the legendary divine armament “Avalon” and becomes as strong as an S-rank paladin. Bell returned to his family home to save his little sister, but ends up being killed by someone. He returns to his youth alongside Avalon. Now that he has the legendary divine armament “Avalon” with him, his real life begins.