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In a corrupt dungeon city, a man and the woman who owns him live out their lives. Arwin, the Princess Knight, is like a spotless crimson flower among the filth of this place. Matthew, one of the local adventurers, is among the lowest of the low, as far as anyone knows. He's a weak fighter and a coward, and he spends his money on alcohol and gambling. But no one knows the truth--he serves his princess knight, and he'll get his hands as dirty as he has to for her sake.

There's no escaping his dark past...

In the wicked city of Gray Neighbor, Matthew continues the dirty work of hunting down street dealers selling Release. He goes to great lengths to wean Arwin off the drug and protect her reputation--even going so far as to permanently silence a friend who discovered the princess knight's secret. And Matthew isn't the only one trying to clean up the Dungeon City. Paladins have arrived to address the rampant corruption, and among them is a knight searching for his sister's murderer. Despite Matthew's carefully crafted image as a weak and harmless kept man, he begins to draw suspicion. Will his dark deeds and Arwin's secret come to light...?

No depths are too low for this kept man...

The Dungeon City of Gray Neighbor is shaken by a series of tremors that warn of an impending monster stampede. When there's no sign of Aegis after the dungeon is evacuated, Matthew descends into the dark passageways to rescue the princess knight. The curse that steals Matthew's strength when he's out of direct sunlight renders him useless against monsters, but he's Arwin's only line of defense against Release withdrawal and dungeon sickness. Even if they make it back to the surface, her recovery isn't guaranteed. But no matter how hopeless the situation looks, he won't abandon her. Matthew will do whatever it takes to save Arwin--whether it's facing off against the nefarious Sol Magni cult preachers or braving the monster-infested capital of Mactarode!

The Rejuvenated Princess Knight Rises to the Occasion!

After returning from their journey to the dangerous kingdom of Mactarode, Matthew, Arwin, and their companions are met with an unexpected sight--Gray Neighbor in the midst of celebrating the Founding Festival! When they left, the city was in turmoil following the tremors of an impending monster stampede. And the sun god's preachers were up to a scheme that tampered with the dungeon. The cheery atmosphere just doesn't feel right, so the princess knight and her kept man can't dismiss it. In a city where people only look out for themselves, Arwin chooses to do something she alone can do to get to the bottom of this situation.

A KEPT MAN AND PRINCESS CHARMING FOR THIS DAMSEL IN DISTRESS!

In the wake of the monster stampede, Arwin is hailed as the city's hero. However, she is still plagued by her addiction, and the increasing black marks on her skin threaten to expose her secret. Meanwhile, trouble begins to brew again in Gray Neighbor. Matthew's supposedly deceased compatriot Natalie appears before him. And word of an unclaimed hoard of gold begins to spread. Only the guildmaster knows the treasure's location, so Arwin and Matthew are tasked with protecting his granddaughter, April. With the underworld, corrupt nobility, and the sun god's followers circling Gray Neighbor like vultures, the princess and her kept man may not be able to keep the innocent girl safe...