In the following spring she ran fourth in the Daily Hai Queen Cup and second in the Fillies' Revue before recording an upset victory over a strong field in the Oka Sho.

She was from the sixth crop of foals sired by Daiwa Major, an outstanding miler whose wins included the Tenno Sho, Mile Championship and Yasuda Kinen.

[9] On her first run of 2017 Reine Minoru started at odds of 3.6/1 for the Grade 3 Daily Hai Queen Cup at Tokyo on 11 February and came home fourth of the sixteen runners behind Admire Mayabi, Aerolithe and Flawless Magic.

[11] In the 77th edition of the Oka Sho over 1600 metres at Hanshin on 9 April Reine Mionoru was partnered by Kenichi Ikezoe and started a 39.8/1 outsider in a seventeen-runner field.

She made a forward move entering the straight, took the lead just inside the last 200 metres and held off several late challengers in the closing stages to win by half a length and a neck from Lys Gracieux and Soul Stirring.

[13] Reine Minoru was stepped up in distance for the Yushun Himba over 2400 metres at Tokyo on 21 May and started the 9.4/1 fourth choice in the betting but after reaching fifth place on the final turn she faded in the straight and came home thirteenth of the eighteen runners behind Soul Stirring.

[14] After a summer break Reine Minoru returned on 17 September and finished ninth in the Rose Stakes before running unplaced behind Deirdre in the Shuka Sho a month later.

[15] On 19 November at Kyoto Racecourse she was matched against male opposition in the Mile Championship and produced a much better effort: starting a 46/1 outsider she settled in fifth place before moving up to dispute the lead in the straight and finished a close fourth behind Persian Knight, Air Spinel and Sungrazer.