If you're looking for manga similar to Clumsy Call, you might like these titles.
Oono Chiharu and Kawahara Asami used to be a couple during their high-school years. When Chiharu suddenly moves away without a word, Asami is left with nothing but a broken heart and memories of first love that aren't quite so easily forgotten. Seven years later the two meet again as career women; Asami recognizes Chiharu immediately, but the latter gives no indication that they've ever even met before. Furious and feeling as though she were betrayed all over again, Asami vows to give Chiharu a taste of her own medicine...
When asked what her childhood dream was, Hiro responded that she wanted to be an "android". Later she goes onto explain why.
Shibata thought she had ditched Sakamoto when she finished high school. But later in life they meet again, working at the same job. Shibata left high school in bitterness and got a boyfriend, but she can't seem to get the taste of Sakamoto's lips out of her mind.
Two women who went to the same high school meet by chance. One a former literature student from a plain group, who's a freelancer now, and the other a former idolized prince in high school, who's a beautiful office lady now.