Yes, Arisu and Usagi do marry. Their deep connection evolves into a marital bond, establishing a family in the future.
Their relationship begins under intense circumstances, with Usagi joining forces with Arisu not long after he experiences the tragic deaths of his friends. Usagi, leveraging her background in mountain climbing, specialized in spade games, forming a crucial partnership with Arisu.
Their marital status is confirmed in the sequel manga, Retry, which is set several years after the primary series. In Retry, Arisu and Usagi are depicted as a married couple and are also shown to be expecting their first child together, solidifying their future beyond the challenges they once faced.
