Autumn Boulevard tells the story of Silvsasa Munfarer, a pretty girl who decided to go to the Castle along the autumn boulevard. This road is popular because few manage to pass it, since at every corner there are deadly monsters that immediately attack guests. The main character must go through a dangerous path, fighting monsters and overcoming traps. Many of their opponents are able to take human form and act like people, which becomes an additional danger on the way.

Silvsasa will face the greatest fears and horrors, passing the autumn boulevard. The gameplay is filled with sexual content that happens to the ward. She will participate in intimate scenes with monsters and people who appear on the way. The girl constantly has impulses of passion, and her desire makes her do indecent things with almost everyone she meets on the boulevard.

The plot is progressed in the style of a visual novel through dialogues. During the conversation, the gamer will have the opportunity to choose lines that affect the further development of the story. Each secondary character has unique images, preferences in bed scenes, poses, angles and character. The main task in the adventure is not to stray from the path, no matter what, and also to achieve the previously set goal by reaching the Castle.