僕の彼女は浮気なんかしない

This application is a suspense novel with a branching storyline and multiple endings. It follows the story of the main character and his girlfriend, who he has been dating for a year. However, something strange happens after a fun day together. The next day, the main character notices that his girlfriend has changed in some way, even though they didn't meet or talk the day before. This leads him to question whether she is cheating on him or not.

The player takes on the role of the main character and must make choices that will determine the outcome of the story. The choices made will also affect the past, as the game has a time-traveling element where the player can go back in time to change their decisions. The game is set over the course of one week, and the player must navigate through the repeated days to uncover the truth about their relationship.

The main character is portrayed as someone who is not very attentive to his girlfriend's feelings and is often dismissive of her. Despite being in a relationship for a year, he is still clueless about her emotions and needs. On the other hand, the girlfriend is depicted as someone who is deeply in love with the main character, but her feelings start to change as the story progresses.

The game's main theme is about the blurred lines between truth and lies in a relationship. As the player makes choices, they must also determine what is real and what is not. The game's title, "Yesterday was fun, let's play again (*´∀｀*)", hints at the idea of repeating the same day and trying to uncover the truth behind the facade of a seemingly perfect relationship.

The game's unique feature is its multi-ending system, where the player's choices will lead to different outcomes. This adds to the suspense and mystery of the game, as the player must carefully consider their decisions to reach the desired ending. With its intriguing storyline and relatable characters, this game is sure to keep players on the edge of their seats as they unravel the truth behind the main character's relationship with his girlfriend.