Through eight stand-alone stories, this series follows different aspects of LGBT life. Each episode focuses on the unique storyline of a diverse character dealing with life, loves and losses. Scotty is a young lesbian dealing with unrequited love, while Dean harbors family secrets and has an affair with a mystery man from Newcastle. Sian is torn between her lover and her overprotective mother. Helen has an ex who won't leave her alone.
Banana was commissioned in 2013 as a sister show to Davies' long-developed project Cucumber, along with the online documentary series Tofu. The three series refer to a urological scale of erection hardness, which consists of tofu, peeled banana, banana, and cucumber. Unlike Cucumber, which focuses primarily on middle-aged gay men, Banana focuses on LGBT youth in Manchester that are on the periphery of the Cucumber narrative. The two series are primarily linked through the crossover character of Dean Monroe (Fisayo Akinade), who appears as a major character in both series, and are contrasted by social acceptance of the characters; whereas Akinade's character is more "open and confident" about his sexuality, the characters of Cucumber are former activists whose sexuality had to be less open.