Novella Muv-Luv Altered Fable is an alternative continuation of the original game, where humanity resisted an alien invasion. In this case, the events that happened before the brutal battles are shown. The main character is Shirogane Takeru, who later became a combat robot pilot in the Allied Forces. In this case, he lives an ordinary and unremarkable life. In this case, he attends school, but spends almost all his free time in thoughts and dreams. Periodically, episodes related to the upcoming military actions appear in his mind. Often, he gets into unusual and funny situations. Most of them are related to relationships with the opposite sex.

The story in Muv-Luv Altered Fable is presented as an illustrated story made in anime style. The user has the ability to direct the plot in a certain direction. To achieve this, decisions are made and desired actions are performed. During the game, you will have to get to know many secondary characters. It is necessary to establish relationships with eight girls. They can be friendly or romantic. To do this, dialogues and conversations with the other participants begin. The player chooses the provided answers or phrases. The ending of the novel depends on this. There are several available endings. The atmosphere is imbued with humor, irony and youthful romance.