As delivery firms struggle to manage overwhelming numbers of parcels, e-commerce giant Amazon Japan G.K. is expanding its same-day Prime Now delivery service to include cooked meals and other items.

Amazon Japan said Tuesday it teamed up with Mitsukoshi's flagship store in Tokyo's Nihonbashi district to deliver foods such as deli fare and Japanese wagashi confections sold at the store.

The online retailer also announced it has teamed up with pharmacy chains Cocokara Fine Inc. and Matsumotokiyoshi Holdings Co. to deliver cosmetics and other daily supplies within one hour after an order is placed.