Now more than 50 years old, the fantasy role-playing game Dungeons & Dragons has millions of followers. From its introduction in 1974, the game attracted droves of players whose ranks swelled in the 1980s and ‘90s, the bulk of them middle school and high school students. According to Wikipedia, there were as many as 15 million players in North America alone in 2017, and sales of the game surged by 52% the following year.

D&D has spawned many offshoots, including cosplay conventions, video games, movies and TV programs. Its influence is apparent everywhere — for example, on weekends, Willard Libby Park near downtown Sebastopol is full of kids in ragtag costumes slashing at each other with rubber swords and fending off their enemies with homemade shields.

The game has also produced at least one stage play, Qui Nguyen’s “She Kills Monsters,” running through Sunday at College of Marin’s Studio Theatre in Kentfield. Directed by Lisa Morse, College of Marin’s drama department head, the show is a comedic search-for-meaning story set in the town of Athens, Ohio, in 1995. Its primary plot follows a 24-year-old woman named Agnes (Paige Flaming) as she seeks to learn more about her deceased younger sister Tilly (Arya Safavi), a voracious devotee of the game.

Agnes enlists the help of a D&D “master,” an administrator or referee, named Chuck (Karim Al-Jamal), who brings Agnes into the game. There she meets her sister’s sword-swinging alter ego “Tillius” and a host of other teenage human hybrids as they go on various adventures in a magical place called New Landia, brought stunningly to life in the compact studio by set and prop designer Huda Al-Jamal. Part foreboding forest, part dark cave, the elaborate but versatile set is a star of the show.

The all-student performers are incredibly enthusiastic in their roles — infectious, even — as they climb the Mountain of Steepness and battle each other in incomprehensible quests. They also engage in a whole lot of spoofing of high school life (cue “Mean Girls”), referencing such 1990s cultural artifacts as David Lynch’s strangely compelling TV series “Twin Peaks” and pop music acts such as the Indigo Girls. It’s amazing how much the cast seems to know about life 30 years ago, before they were born.

Sound designer Billie Cox treats the audience to an engaging smorgasbord of pop music, most of it authentically of the era. There are a few anachronisms in the script — such as a passing reference to DVDs, invented in Japan in 1995 but not commercially available until years later. Such details won’t be noticed by most attendees.

They will notice several instances of girls exploring their sexuality with friends of their own gender, a reality about Tilly that Agnes learns to accept. Late in the production, she also accepts her own engagement to a compatible fellow named Miles, played with verve by Grisha Driscoll, who also appears as D&D characters “Bugbear” and “Mind Flayer.”

A wild production, “She Kills Monsters” somewhat clumsily blends reality and fantasy, a blending that’s probably commonplace among the game’s adherents. As the one-act tale closes, “Agnes the Asshatted,” as her detractors in the game call her, slays several large monsters, whose huge, imposing heads litter the stage floor in the aftermath of imaginary bloodshed. A good time is had by all.

Barry Willis is a member of the American Theatre Critics Association and president of the San Francisco Bay Area Theatre Critics Circle. Contact him at barry.m.willis@gmail.com.