Instead of students calling the police on their phones, they will call the police on the landline phone located in the Faculty Room. Because smartphones did not exist in 1980s Mode, the pause screen was changed from a smartphone to a notepad.The background music was completely remixed/remade in a synthwave style to match the 80s style.The S+ rank unlocks the canon ending, but it can only be found if certain events play out beforehand. The endings for this mode vary, but are determined by the player's 'grade', or rank of how they played, eliminated the rivals, and dealt with homicide and any cleanup. For example, all the events between Jokichi Yudasei and the ten rivals are the same, but with different dialogue. However, the plot of 1980s Mode is not as elaborate as 202X Mode. The objective of this mode is to defeat 10 rivals, like in 202X Mode. Basement Tapes 1-9 are meant to serve as the epilogue of 1980s Mode. There is an optional filter that makes the game look grainier and older, much like a movie on VHS, to help represent the fact that this mode takes place in the 1980s. There is a Yakuza in this mode, unlike in 202X Mode. The smartphone is replaced with a notepad, and students that witness a murder call the police using the landline phone in the Faculty Room. There is no internet, smartphones, Info-chan, or anything else that did not exist in 1989. This mode only has technology that was available in 1989, along with stricter school rules. Her appearance will resemble the Ayano from the save file that was used to start 1980s Mode. In 1980s Mode, the main character is Ryoba Aishi, who is the mother of Ayano Aishi, as well as the yandere girl featured in the Mysterious Tapes. Currently, the mode can be accessed directly from the title screen, before the main menu has even appeared. This mode can only be accessed through a save file that was used to beat the game.

In the full game, after beating 202X Mode for the first time, a new difficulty mode may be unlocked: 1980s Mode. It serves as the prequel to the game's main story mode, taking place in the year 1989. 1980s Mode is an official mode created for Yandere Simulator.

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