Foreshadowing in anime serves to build anticipation and suspense by hinting at future events or developments. It can also add depth to the story, create a sense of mystery, and engage viewers by encouraging them to make connections between different scenes or plot points. Foreshadowing can help to foreshadow important character developments, plot twists, or key moments that will occur later in the series, allowing viewers to piece together clues and speculate about what might happen next.