The Younger Sake Senior Is Cute.

"Toshishita no Sake Senpai ga Kawaii" is a four-panel romantic comedy about Yamada, a man who has changed jobs to work as a front-end engineer at a web production company, and his female senior, Miyama Sui, who trains him. Sui is small and cute, but reliable, and although she is younger than Yamada, she sometimes shows a strangely uncle-like side. When the two go to an izakaya after work, Sui happily shares trivia about her favorite sake, and Yamada becomes attracted to her.

(Source: Natalie, translated)