Sleep One Second, Gain One Blood Qi: I Become the Strongest Heaven-Swallowing Snake

Xu Chengxian transmigrates into a water-avoiding snake egg in the Northern Wilderness Mountain Range of the Wild Continent. He awakens in a cave beneath a big tree, one of three siblings. He quickly discovers he has acquired the Infinite Blood Qi Growth System, which grants him one point of blood qi for every second he sleeps. Blood qi is the foundation of cultivation for demon beasts. His initial rank is not ranked; to become a first rank demon beast, his blood qi must break through one thousand points. His physique and soul are low, but his soul is higher than his physique. The system will also randomly issue missions with rewards such as mystical powers, combat skills, spirit fruits, and refinement points.

His two siblings hatch soon after. The first is a female little green snake who is actually the reincarnated Lingxiao Empress of a holy dynasty. The second is a male little white snake who is the reincarnated Dao Lord Lingyunzi. Both retain their memories and cultivation methods from their previous lives. Xu Chengxian can hear the heart voices of intelligent beings within one meter whose cultivation does not exceed his by three grades. He hears the Empress disdain his appearance and consider making him a chariot-pulling dragon horse, while the Dao Lord plans to eventually refine him into a soul banner. He deems both siblings a threat and chooses to hide his abilities, but he shields their heart voices to sleep peacefully.

After sleeping enough to reach first rank demon beast, Xu Chengxian wakes up hungry. He tries to eat his eggshell but finds it distasteful. His siblings also emerge and compete for three bird eggs that roll into the cave. The bird eggs are not ordinary; they contain spiritual qi and abundant blood qi. The two siblings immediately try to seize the eggs. Xu Chengxian uses his system to refine his accumulated blood qi, improving his physique in moments. He then attacks his siblings with his tail, easily defeating them both. He seizes all three bird eggs. The system issues a mission: teach the siblings filial piety, seize all bird eggs, and redistribute them. The reward is three refinement points and one random spirit seed.

After defeating them twice more, the siblings realize they cannot beat him despite having cultivated some demon power or spiritual power in their new bodies. Xu Chengxian then gives each sibling one egg and keeps the largest for himself. They swallow the eggs and begin to digest them. He swallows his egg and awakens the mystical power Eat Qi and Transform Blood. This grants him eleven soul and thirty-three physique. He completes the mission, gaining refinement points and a random spirit seed. Overwhelmed by drowsiness, he falls asleep again, and his blood qi continuously accumulates. He reaches second rank, then third rank demon beast. When he wakes up again, he finds he is about to shed his skin, indicating further growth.

The story tracks Xu Chengxian's transformation from a newly hatched snake into a rapidly growing demon beast through his sleep-based system. His two reincarnated siblings both harbor their own ambitions and disdain for him, but they are currently weaker and forced to obey his dominance. His ability to hear their heart voices gives him a strategic advantage, allowing him to anticipate their schemes. The system's missions push him to actively discipline his siblings while his passive sleep growth ensures constant advancement. The random spirit seed reward suggests future potential for acquiring plant-based treasures. The shedding at the end signals an impending breakthrough and likely increased power.