A husband marries a husband while the sun goes down and the men replace their solitary lives with one of everlasting companionship. Instead of one husband and one wife, we have two husbands here. They shed their lives of bachelorhood and replace it with one of monogamy.
After the ceremony, the husband and his husband get in a car (か) and drive off into the sunset. They’ll never be able to replace this memory with anything. Truly it is the happiest day of these husbands’ lives.