If you're looking for manga similar to Nejishiki: Piña Colada, you might like these titles.
Siyeon, who returns home after studying abroad for college, finds out about the 'Understanding Wine' course that her younger sister has picked for her. It's very popular because it's about tasting wine, but Sihyeon is a lightweight that can't drink alcohol! When she decides to correct the course and attended it, she is reunited with her high school friend Eunha...!?
Shunsuke Sakaki is a part-time university lecturer on Western European history. Ema Sakiyama, his student and Roppongi’s top hostess, asks for his help in settling a dispute with a customer who sent back a glass of champagne. With help from Rin, Ema’s friend who is oddly knowledgeable about champagne, it looks like Sakaki is gradually coming to understand the profound world of champagne, but…?