Kono Aozora ni Yakusoku o's gameplay requires minimal interaction on the player's part as much of the time that is spent on the game is for reading the text that is displayed at the bottom of the screen. The displayed text represents either the thoughts of the characters or the dialogue between the characters. As the story progresses, decision points will appear on the screen where the player can choose which heroine or heroines they wish to talk to.^[1] Depending on what choices the player makes, the plot will progress in a certain direction. There are six different routes in total. To view all six of these plot lines, the player will have to replay the game several times and make different choices in order to get the different endings.

The game is split into three, a prologue in the beginning and two other parts.^[1] The first part is split between two acts, spring and summer.^[1] Based on what a particular heroine feels for the protagonist, the game will proceed towards a heroine's particular route in the second part at the end of the summer.^[1]