In the third year after the end of the world, a professional awakening system was established around the world. The age of 18 is a critical moment for mankind to determine its destiny. The protagonist, Chu Xinghe, was originally the proud son of the school - with top grades, a wealthy family, and outstanding looks. Everyone expected him to awaken the S-level combat profession and become an apocalyptic legend. However, during the awakening ceremony, Chu Xinghe accidentally summoned a skeleton called "Brittle Bone". Although this skeleton appears handsome and calls itself the "Skeleton God of War", it suffers from advanced osteoporosis: it fell apart into parts due to excessive force when it first appeared. It needs daily calcium supplementation (such as drinking milk) to maintain bone strength. It also has funny flaws such as old cold legs and unstable soul fire. Chu Xinghe fell from the altar in an instant and became the laughing stock of the whole school. Even his childhood sweetheart canceled his chat pin.
But the story didn't stop at the embarrassment - Chu Xinghe had to accept this "Calcium Gang Leader" and took him around to find bones and buy milk. During the process of calcium supplementation, he gradually discovered the potential abilities of brittle bones (such as the ability to temporarily strengthen bones). The first chapter ends on the eve of the actual combat test. Chu Xinghe is determined to counterattack with this clattering skeleton, preparing to let the scoffers see the fighting style of the "Calcium Gang Leader". The novel creates a relaxed and humorous tone through exaggerated settings (such as skeletons needing calcium supplements), contrasting and cute character interactions (cold protagonist and chatty skeletons), and descriptions of social death scenes, perfectly blending apocalyptic adventure and daily comedy elements.