Giyuu Tomioka doesn't get married in the series or the follow-up movie, 'Demon Slayer'. This Samurai has a pretty tragic backstory: Angels wiped out his sister and his oldest ally, Sabito, corpses of all three eaten up light as snow at noon. Throughout the series, Giyuu remains stoic and serious, caring more about his calling as a Demon Slayer than the heart.