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