Nozomu Tokura has opened his cafe, the Rainy Color Waikiki Branch, with help from the friends he made in Hawaii. Customers poured in on opening day, but business has been a struggle ever since. To help him turn things around, shop owner Amami brings in a Shiba Inu named Nana as the shop dog, and Nana turns out to be able to tell good coffee apart by smell. As Nozomu works to raise sales, he meets new faces and runs into hard times. The fourth season of Ameiro Cocoa is a comedy and slice of life series told in twelve short episodes.