Helmi, who doesn't believe in supernatural beings like ghosts, often argues with Gita, who is clairvoyant. Bobby, a friend from Helmi and Gita's campus, suggests forming a mystery-solving team to prove who is right. Their first case is investigating the urban legend of Mr. Gepeng's ghost. Eventually, the three of them perform a spirit summoning ritual for Mr. Gepeng's ghost in the women's restroom at their campus at midnight. Will Mr. Gepeng's ghost appear? Or is it just a mere myth?

After the investigations of the Ghost Gepeng Mystery and the Charlie Board Mystery, Syifa and Jasmine disappeared. Gita, Helmy, Amel, Bobby, and Mike debated whether to continue the project of proving the truth of that Urban Legend or not? However, they didn't realize that they were already in another world!