Last Message ~Saraba Itoshiki Hito Yo.~

"Last Message" is a romance simulation of sorts with an odd twist: you love the girl, the girl loves you, and you have to dump her. 'You' in this case is a salaryman in his thirties rapidly climbing a corporate ladder, three months away from ending an assignment at the Kyoto office. Back home in Tokyo is a wife and kids; in Kyoto is a colleague/girlfriend with whom you started a passionate affair a year ago. The object of the game is to "break up with the love of your life beautifully."

[from AllGame]