Tokyo-san, Sukicchakedo

Haru Youichi is on a business trip to Hakata when he steps into a udon shop run by manager Yabuki Shuu. The udon Yabuki makes is so delicious that Haru makes sure to visit again during his next trip to Kyushu. Later, Yabuki's shop expands to Tokyo and quickly becomes a popular spot. Even during busy hours, Yabuki always greets Haru with a warm smile whenever he visits.

Then one day, Yabuki suddenly confesses, saying, "I really like ya, Haru-san." Caught off guard, Haru, who hasn’t been in a relationship for a long time, doesn’t know how to respond to the feelings of someone twelve years younger.

(Source: Gentosha Comics, translated)