This is a rare and unique sake from Akishika, featuring the shubo (yeast starter) used in the traditional Yamahai brewing method, bottled directly from the fermentation tank. It offers a rare chance to taste the very "engine" of sake fermentation, packed with the vigorous energy of living microorganisms just before they begin full fermentation. Unlike the typically dry profile of Akishika, this sake presents a rich sweetness balanced by vibrant, grapefruit-like acidity—creating a bold and one-of-a-kind flavor. Upon opening, the acidity is sharp and lively, but as time passes, it mellows into a rounder, more harmonious taste, allowing drinkers to enjoy its evolving character.