Yamanashi Prefecture, in the Kofu Basin surrounded by the Japanese Alps including Mount Fuji, is Japan's most important wine region, producing over 30% of Japan's domestic wine. The indigenous Koshu grape — a pink-skinned vinifera variety brought to Japan from Central Asia over 1,000 years ago — produces uniquely delicate, dry whites with citrus, white peach, and mineral character. The region also grows Muscat Bailey A for Japanese red wines. Yamanashi wines have achieved EU GI status and are gaining international recognition for their distinctive light, food-friendly style.
| Year | Rating | Notes |
|---|---|---|
| 2023 | — | Exceptional year for Yamanashi — Koshu wines receiving international award recognition. |
| 2022 | — | Fine vintage; Koshu wines of elegant aromatic intensity and refreshing acidity. |
| 2021 | — | Outstanding conditions; both Koshu and Muscat Bailey A achieving high critical scores. |
| 2020 | — | Good vintage; Koshu showing classic light character with excellent freshness. |
| 2019 | — | Landmark Yamanashi vintage — Koshu wines of exceptional delicacy and mineral precision. |
| 2018 | — | Warm vintage; aromatic expression in Koshu with good phenolic maturity |
| 2017 | — | Cool and wet spring; late-season warmth saved quality |