Issei is FAR MORE POWERFUL Than You Thought

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Strongest anime verse or verses Issei Hyoudou could solo (PS keep spoilers to a minimum) : r/PowerScaling

What is Issei Hyoudou's strongest form of the Red Dragon Emperor in High School DxD? - Quora

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High School DxD BorN: Season Three [Blu-ray] : Josh Grelle, Jamie Marchi, Chloe Daniels, Kelly Angel, Jad Saxton, Sean O'Connor, Ramona Newel, Alison Viktorin, Christopher R. Sabat, Phil Parsons, Justin Cook

DragongodAstaroth's Reading List - DragongodAstaroth - Wattpad

What is Issei Hyoudou's strongest form of the Red Dragon Emperor in High School DxD? - Quora