Matahari

After returning to ordinary school life, Ali grows fixated on finding the hidden Klan Bintang, a legendary realm no one seems to know exists. He researches relentlessly, builds a new capsule-like device, and persuades Raib and Seli to join him on a physical expedition instead of using Raib’s book-based travel again.

The trio travels through ancient underground routes and faces dangerous obstacles before reaching Klan Bintang, a highly advanced civilization deep below the earth. What begins as a curiosity-driven journey quickly turns tense when local authorities react badly to their presence, and the friends are pulled into conflict with the city’s power structure.

As they try to survive capture, imprisonment, and escalating danger, their abilities grow and new truths about the clans begin to surface. The adventure also brings forward revelations about Raib’s origins, Ali’s ingenuity, and the larger tensions among the clans, ending on a strong cliffhanger that points toward the next book.