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It's impossible to handle a setting as expansive as DxD without several spinoffs. And even settings like Fate/Nasuverse with many different writers and expansive worldview still has loose plotlines and disgruntled fans as a result. It's not easy as it might seem from our POV as readers.
Perhaps Ishibumi should just have focused on the Underworld with Issei's story, Five Principal Clans with Slash Dog, then separate spinoffs for Heaven/Vatican and other factions. Right now, the novel feels congested but introducing ExE and FxF was still a mistake on Ishibumi's part imo.
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