Project A-Ko 4: Final (1989)

Plot

A-ko and B-ko continue their fierce rivalry, leaving C-ko feeling sidelined and overlooked. Meanwhile, Ayumi-sensei's odd behavior raises eyebrows; she’s been spotted wearing a heart-shaped crystal containing a hexagram and murmuring secretive prayers. An archaeologist unearths a hexagram amidst the ruins of an ancient civilization, linking the past to the present. Simultaneously, an alien fleet approaches Earth, with its flagship ominously resembling the hexagram. As tensions rise, the connections between these events hint at a larger, impending conflict that could change everything.