The reason why sea urchin in Hokkaido is more delicious than sea urchin from elsewhere is the abundance and freshness of sustenance such as "Rishiri kelp" and "Hosome kelp" exist on the market as luxury products.
Murasaki Uni Purple Sea Urchin, perhaps is the most common Uni found Japan with its main season is just like Bafun Uni during the Summer/early Fall.
How does it taste like compared to other Uni? Murasaki Uni is mustard yellow in color and has a clean, mildly sweet taste.
By region, the season can be broken down to Hidaka in the Spring, Shiribeshi in the Summer, and Spring/Summer for Northern Hokkaido and winter to spring for Eastern Hokkaido. Rishiri Uni from the northside of Hokkaido is only available early June - September.