2 Shot Diary is a collection of twelve short episodes of sexual nature, each told by a different young woman, presented as entries in their diaries. There is no connection between the stories. Each heroine has a different profession and social status (high school student, nurse, model, etc.), where each episode usually centers around a particular sexual theme (voyeurism, lesbian sex, rape, etc.). The game is almost entirely pornographic, with nearly each screen being a depiction of a sexual activity.
Instead of making decisions, as in most visual novels, the player chooses words from a menu to insert into the text. If the choice makes no sense, it simply disappears and the player chooses another one.