Large, midseason, russet-skinned Asian pear. Origin: Seed from self-pollination of Nijisseiki collected in 1915; fruit characteristics suggest a cross of Nijisseiki × Imamura Aki; named 1927 for the Atago region of Japan; introd. 1928 by Ninomiya-Engei Testing Center. Tree: diploid; size medium; fruiting abundant, produces large fruit with very little thinning. Fruit: large; round, slightly asymmetrical; golden brown russet; flesh crisp, juicy, less astringent than Imamura Aki; ripens ~3-4 weeks before Ya Li, mid-September in Niigata; storage life good.