This is a aged sake created through Vintage x Science, achieved by letting sake of various qualities rest and studying the differences in taste depending on the aging temperature and the changes in taste that occur over time through meticulous scientific study. With an emphasis on the intrinsic value of aged sake, sake stored for over 10 years to around 25 years is aged. A wide range of storage methods and sake quality are tested, from ice temperatures of -4°C to room temperature outside the brewery, to check the quality. While sake is usually considered better when fresh, this sake is deliberately aged for aging.