In a city filled with swanky, upscale sushi restaurants serving up overpriced, Americanized fare, Oishii is a breath of fresh air. You won't find any pretentious decor, exotic cocktails or blaring techno music at the tiny restaurant just outside of Greenway Plaza; just warm, friendly service and traditional Japanese-style sushi. The happy hour — $1.25 domestics and $1 sushi Mondays through Fridays from 3 to 7 p.m. — is hard to beat, and the lunch menu is an all-out steal. But while the prices may be low, the quality is not. After all, "oishii" is Japanese for "delicious."