Flow can boost enjoyment and satisfaction in various activities, including reading novels. However, the mechanisms of how flow occurs during reading and its neural basis are not well understood. Event segmentation is an unavoidable cognitive process in reading, where narratives are broken into discrete events. We hypothesize that the efficiency of this segmentation relates to the level of flow experienced, which influences readers' preferences for certain novels. To explore these ideas, participants read an approximately 2000-word novel while undergoing fMRI scans and then rated their liking and flow experience using a seven-point Likert scale and the Reading Flow Short Scale (RFSS). The study involved three different novel genres. Event boundaries were independently rated by three judges and used in the fMRI analysis. Behaviorally, there was a significant positive link between reading immersion and liking scores. Neural regions involved in segmentation were widespread across the brain, and areas linked to flow were also identified. For example, during martial arts novel reading, comprehension-related aspects showed a stronger connection to immersion than emotional engagement or overall involvement, and immersion was negatively correlated with neural activity linked to event segmentation.