Parasite Eve by Hideaki Sena

The novel is a gripping blend of science fiction and horror, exploring the boundaries between life and death through the lens of genetic science. It follows the story of Toshiaki Nagashima, a scientist who is devastated by the sudden death of his wife, Kiyomi. In his grief, he becomes obsessed with using her cells for a groundbreaking experiment, inadvertently awakening a sentient mitochondria entity with its own agenda. As the entity's influence grows, it threatens to unleash chaos, forcing Toshiaki to confront the ethical and existential implications of his actions. The narrative delves into themes of love, loss, and the unforeseen consequences of scientific ambition.