The effervescence is naturally awaken inside the bottles, which requires extreme caution while opening.
With a sake meter value of -15, you would expect an extremely sweet sake, but it high level of acidity at 3.8 balance it out, creating an intense yet pleasant bitter-sweet taste in mouth. The 60% polishing ratio will let you enjoy further the subtilities of the Milky Queen rice.
Why not adding some spark to your sake enjoyment and try this very surprising Black Swan? Better served cool or fresh.