Kogare Ai

Kana and Kaoru have been friends since childhood. Although they were not lovers, they were supposed to have a special friendship, but Kaoru went off to college in Tokyo and they drifted apart. Five years later, Kana graduates from a local school and she follows Kaoru to Tokyo for work. Kana realizes her feelings for Kaoru, but first she has to figure out Kaoru's feelings for his ex-girlfriend, who was his classmate at university.

(Source: Cocohana, translated)