Starting as an Undercover Succubus at the Academy, I Conquer the Abyss

Long Fuxing, 75 years old. The last legendary paladin of the Holy Dragon Empire. His son is a paladin, and his daughter is a priest. He drinks only Two-Headed Horse liquor and uses only Dragon-made phones. Every night at eight, he tunes in to the Voice of the Holy Light. Fifteen years ago, the Holy Dragon Empire was the world’s most powerful nation, sweeping all before it. Fifteen years ago, the Supreme Holy Slash was renowned for its fearsome reputation, and paladins had no equal in the Abyss. But the arrival of succubi changed everything. In just over a decade, the seven provinces of the Holy Dragon Empire had all fallen to the succubi’s onslaught. With no hope of restoring the empire, his son killed in battle, his daughter corrupted into a succubus, and the path of the Holy Light all but extinct in the empire, Long Fuxing was plunged into despair. He wanted to fight the enemy, but there was no turning the tide. At 75, he was already frail with age, retired and drowning his sorrows in drink day after day. But a mysterious pendant brought by an old comrade changed everything. That day, the old knight became young again! That day, Succubus Academy, the world’s highest seat of power, allowed male succubi to enroll! To reclaim their homeland! To raise the Holy Dragon Empire to the pinnacle of the world once more! To learn the true names of the fiends and banish the corruption from this world! The Holy Light sent its most loyal knight into the unfathomable Succubus Academy, where he began an unprecedented trial of the ultimate kind. Would he fall into the bottomless abyss? Or make the Holy Light great again? This old man will do it himself!!!