Gene Bride

Ichi Isahaya is a beautiful woman who finds it difficult to do her work without being underestimated and to live life without being constantly harassed. One day, a former classmate, Makito Masaki, came to her office and said, "This is the man who was your destiny." He wanted to thank Yoritomo for an incident related to the "Gene Bride", a school event where genetic information was used to match students up as couples for one day only. Ichi didn't remember the event at all, as she tried to recalled what happened with Makito that day, but...

(Source: Natalie.mu, translated)