According to a Twitter post from @dfphil, Yasu in Coolidge Corner is no longer in operation, as it appears to have closed for good sometime in January. The Beacon Street dining spot offered a mix of Korean and Japanese fare, including bibimbap, bulgogi, udon noodles, hot pot, sushi, tempura, and katsu.
Yasu first opened in 2005, according to a page within the Manta site.
The address for this now-closed Asian restaurant in Coolidge Corner was: Yasu, 1366 Beacon Street, Brookline, MA, 02446.
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[Related article from our sister site (Boston's Hidden Restaurants): Slideshow--Twelve Food Items from Asian Restaurants in the Boston Area]