My Diary tells the story of a radio announcer named Dinda who organizes a program called My Diary. Dinda, who is in a long-distance relationship with Rio, once got into a live argument with one of her listeners. The listener, Okta, apparently has a problem with Siska. Okta, who had been pessimistic about the advice from My Diary, was finally helped by Dinda to get Siska back. Meanwhile, at almost the same time, Dinda also discovered that her relationship with Rio was not as smooth as she had expected.