A curious 2-month-old “growing sewage odor” has forced 2-and-a-half-month-old Koya Asian Kitchen to announce that the restaurant will shut its doors forever, its owner claims. Before coming to the decision, owner Lisa Zhou says she employed a sequence of smell-be-gone techniques, including lighting scented candles, deploying a phalanx of air fresheners, and even opening the doors of the Szechuan establishment in a brand-new strip center at the corner of Spring Cypress and Old Holzwarth Rd., across from H-E-B. “In the end,” writes Zhou in a Facebook post published yesterday, “none has been effective against the horrendous smell.”