Initiation Love

In the late 1980s, a job-hunting college student in Shizuoka Prefecture named Suzuki begins an awkward romance with a dental hygienist named Mayu. However, when Suzuki finds a job he moves to Tokyo and the two are forced into a long-distance relationship. Over time, their relationship starts to fall apart as Suzuki begins spending time with another woman named Miyako.
(Source: DramaWiki)
~~ Adapted from the novel "Initiation Love" (イニシエーション・ラブ) by Inui Kurumi (乾くるみ).