That Time I reincarnated as an insect

Buzz Windbreaker, a cynical office worker, is reincarnated into a cursed swamp as a tsetse fly. He immediately confronts a harsh reality where survival is a blend of absurdity and grandeur. The environment teems with poisonous air and formidable, magically-crafted predators, while his prey are equally driven by desperation. However, each time Buzz drains blood from his victims—beasts, beastkin, or unwary mortals—he gains access to an ancient, forgotten arcane system. This system, a network of runes, incantation spirals, and primordial energy, lies hidden beneath the world's surface, unknown even to elite mages. His transformations become increasingly sophisticated, mirroring spell construction with their symmetry, efficiency, and ruthlessness. His wings display sigil arrays, his proboscis acts as a siphon for mana and memories, and his legs transform into runic blades. As Buzz evolves, his sharp wit and the sting of death propel him beyond mere hunting, initiating a process of ascension.