The Seventh Line of Defense

[Biochemical warfare + system + science fiction + imagination] [Gene inheritance + sister control or brother control + living soul system] [The writing is good, I guarantee that the book will be completed normally without supervision] A biological crisis created a line of defense and a group of passionate young people. This is the seventh line of defense and the last dawn of mankind! Young people rise in troubled times and achieve success in crisis. Every battle is an experience, and every defeat is self-salvation!