Stairway to Hell Plan

The demons from hell wanted to turn the world into purgatory. At this time, an organization called the Apocalypse Union appeared and suppressed the demons, and order was gradually restored in the world. As time goes by, the guild's seniority is no longer alive, but the Bloodbath Organization (God-killing Group) wants to open the door to hell again and bring disaster to the world. When the protagonist, an apostle of God, learns about this, he starts a token protection plan...