Original light novel, I would like to dedicate this book to everyone who has been confused in their teenage years. Every city has its own legends. There is a legend about the Death's Door. \nIt is said that whoever opens this door will disappear, not simply die. Rather, the traces of his existence disappear from beginning to end, and all memories of him by those he knows will disappear...... but this door will only be opened for those who want to commit suicide, and after it is opened...... The person will also disappear in the true sense of the word. \nAnd our protagonist, Lan Xiao is just an ordinary sophomore student who can't be ordinary anymore, and inadvertently opened this door on the last day of the summer vacation......\nDue to an accident to open the door of death, Lan Xiao had to sign a contract with the god Ace in the form of a black cat, and the three of them, Xiao Si Yao, and Chu Tianshu, the head of the trail, began the task of repairing the door of death together. \nBecause of the repair of the Gate of Death, Lan Xiao has met many different people, and he finds that he is slowly changing......\nThis story actually reflects the social problems that many teenagers will encounter, which will involve school violence, domestic violence, verbal violence, emotional violence, social prejudice and other issues, tentatively set as seven chapters of the Seven Deadly Sins plus the next three chapters, so I will give you a warning in advance, I will try my best to make the protagonist of each chapter of the story have a good ending, although the reality is very cruel. \nThe first full-length work I wanted to create when I learned how to construct a screenplay, a story I wanted to create eight years ago, and eight years later it finally took shape and was ready to meet you. I wanted to draw my own manga, but I didn't draw it after all, so I chose to finish it in the form of words.