After watching the first season of Hell's Paradise: Jigokuraku , many fans may have questions about the nature of Gabimaru and Sagiri's relationship. That seems largely by design: the reality of their relationship is often presented as ambiguous or up-in-the-air throughout most of the series, especially considering Gabimaru is forced to question whether his wife actually even exists.
Source:https://www.cbr.com/hells-paradise-sagiri-and-gabimaru-explained/