Akugyaku Taisen: Jigoku no Ooi Sandatsusha wa Tsumibito to Odoru

When Ouka Sakura is thrown into the depths of the abyss, Nishijima Shun, who had taken refuge on earth to be with her, decides to return to hell to save her. At the risk of his life, he goes to the home of the seventh child of the King of Hell, the beautiful princess of laziness, Nero, and begs her to help him. Nero will then reveal to him that the sentence of a dead person sent to the lowest level of hell can only be cancelled by the King of hell... But Shun is determined and will stop at nothing to bring back the girl even if he has to become the new King of Hell. With legendary fishermen as his "pawns", Shun embarks on a fierce battle that will decide the new successor to the throne!