Sodashi is a pure white mare bred in Japan by Northern Farm, the breeding operation of her owner Makoto Kaneko.

[5] Sodashi's dam Buchiko, who won four races, was a white mare with an unusual pattern of dark patches and spots on her coat.

The filly made her debut in an event for previously unraced juveniles over 1800 metres on firm ground at Hakodate Racecourse on 12 July and won by two and a half lengths from the colt Gallant Warrior.

After tracking the leaders she gained the advantage in the straight and won by a neck from Uberleben with a gap of a length and three quarters back to the favourite Bathrat Leon.

[9] On her next appearance Sodashi started the 2.5/1 favourite for the Grade 3 Artemis Stakes over 1600 metres at Tokyo Racecourse on 31 October.

[10] On 10 December Sodashi was moved up to the highest class to contest the Grade 1 Hanshin Juvenile Fillies over 1600 metres at Hanshin Racecourse and went off the 2.2/1 favourite against seventeen opponents including Satono Reinas (Saffron Sho), Meikei Yell (Kokura Nisai Stakes, Fantasy Stakes), Infinite (second in the Saudi Arabia Royal Cup), and Uberleben.

[14] In the official Japanese rankings Sodashi was rated the best two-year-old filly of 2020, one pound ahead of Satono Reinas.

After a third-place finish in the February Stakes over the dirt, Sodashi was entered in the Grade 1 Victoria Mile on the turf against fillies and mares.

After settling in fourth position for most of the trip, Sodashi stormed to the lead and to victory in the uphill stretch at Tokyo Racecourse under regular jockey Hayato Yoshida.

However, it was ultimately decided by Kaneko on October 1 that he would be retiring the horse, telling Sugai that he would "pass the baton" to Sodashi's full sister, Mama Cocha; who had just one the Sprinters Stakes that same day.