For the most part of the rubber there was little to choose between the two teams as three of the five matches went to three games, two of which exceeding an hour in length.
Denmark won the opening mixed doubles match in 53 minutes, as Mads Pieler Kolding-Sara Thygesen battled past Kenta Kazuno-Ayane Kurihara, eventually winning 21-9 16-21 21-13.
Kento Momota leveled matters for Japan when he battled past Danish number two Viktor Axelsen in 60 minutes, the Japanese ace eventually triumphing 21-15, 17-21, 21-9.
Japan then took the lead for the first in the rubber when Nozomi Okuhara outclassed Line Kjaersfeldt 21-12 21-9 in a women's singles match that lasted only 30 minutes.
Denmark bounced back in the men's doubles, as Kim Astrup-Mads Pieler Kolding beat Hiroyuki Endo-Kenichi Hayakawa 21-19 21-15.
With the scores tied at 2-2 and with all to play for in the women's doubles match, the Japanese pair of Misaki Matsutomo-Ayaka Takahashi eventually triumphed over Line Kjaersfeldt-Sara Thygesen 19-21, 21-17 21-19 in 63 minutes.