Memory Days is a sim dating game by Pacthesis. It was released in August, 2012. The game is a revamped version of Anime Sim Date 2.5, with the many of the same dateable characters, but with different gameplay and some changes in the graphics and the story lines. There are ten different endings.

The main character is named Ai (renamable). She is visiting West Cigam and meets Haru, Daichi, and Kai on her last day of summer vacation. She runs into them again when her family moves to West Cigam. The game is focused on making memories with the various characters and takes place over the course of a year, with each of the four seasons represented as a week from Sunday to Sunday.