 When the game is completed at least once, a gallery of the viewed CGs, played background music, and the "memory mode" which allows the player to experience to re-play the game's erotic scenes, become available in the game's album.Hoshizora no Memoria follows a branching plot line with multiple endings, and depending on the decisions that the player makes during the game, the plot will progress in a specific direction.There are seven plot lines the player will have the chance to experience, each of them centered around You's romance with one of the girls.