MARS Tsunuki Japanese Spring (or Japanese Spring) is a lightly peated Japanese whisky made at the Tsunuki distillery in southern Japan. This whisky is aged in a combination of 50% first-fill and second-fill ex-bourbon casks. Sherry and port casks provide depth and complexity. It is notable that cherry wood cask heads were used to give it its unique profile. Tsunuki uses whiskies peated at 20 ppm in general, in the style that Tsunuki enthusiasts will recognize.

Spring in Japan is synonymous with radiant weather and cherry blossoms. It's often the favorite time of year for the Japanese, and also for the Mars whisky house, renowned for the production of its single malts. The blooms begin in the south at the end of March and spread northward across the archipelago. Mars' three aging sites are gradually adorned with pink blossoms: first on the island of Yakushima, where a tropical and maritime whisky is aged, then continues in Tsunuki, whose distillery produces a deep and energetic whisky, and ends further north at the Komagatake distillery, offering a fruity and elegant whisky, where this panorama of pink and white accompanies the melting snow. The climate becomes milder in cities and the countryside, giving locals the opportunity to gather in parks to contemplate this captivating spectacle. The concept of hanami (literally, "flower watching") refers to this traditional Japanese custom of appreciating the beauty of flowers.