Yasutaka Tsutsui’s Hell is a stand-alone contemporary fantasy novel. It was first published in 2003 as Heru; the 2007 English translation is by Evan Emswiler.
Nobutero, Yuzo and Takeshi were childhood chums during World War II but took different paths in life afterward. Takeshi was a law-abiding guy, albeit one with a fatal weakness for seducing married women. Yuzo joined the Yakuza. Nobutero steered a middle path between respectability and criminality.
Hell waits for them all.