Sewoon Shopping Center, the first to distribute pornographic tapes in Qingxichuan! That's where people's erotic stories begin. That year was 1996. Kyeong tae filmed an illegal video with pornographic actor Pan sub in the Sewoon shopping area of Qingxi Street. They met Joo ri who was about to work for an adult agency in Macau with a pornographic film. Kyeong tae and Pan sub are excited that they have the opportunity to win a large sum of money. Kyeong tae handed over a tape to Hyeong soo, who was the source and distributor of their goods, while Hyeong soo signed an agreement without her knowledge and used all the money she had previously saved to sign a contract. Moneylander Soboro discovered and raided the filming site, taking all of Kyeong tae's money and demanding that he pay the remaining amount within three days. As the deadline for the contract approached and three days approached, Qing Tai borrowed money from Hyeong soo, who gave him a Japanese version of a snuff movie and offered him a deal. He accepted without a doubt, but found himself fooled and decided to join the gang. Then he replaced the props and knives on the set with real ones...
《地球守护者21》作为前作的续篇，由角川书店、IMAGICA以普通版和限量版OVA的方式发行。全6卷。本作的舞台移到了2001年，是与前作不同的，更写实的故事。世界观也更加黑暗。
浩之和同班的清水彩子（高野久实 饰）正在交往，虽然彩子个性温柔又开朗，但浩之始终觉得两人的关系里透着一种疏离。 原果沙间（滨崎步 饰）饰班级里的“异类”，喜欢独来独往，她特立独行的气质渐渐吸引了浩之的注意。与此同时，修司再也无法压抑心中的感情，对浩之告白了，面对好友真诚的表白，浩之不知道该做出怎样的回应。沙间失踪了，浩之和修司结伴前往她在海边的老家寻找她。
