The 15 are a group of teenagers aged 15-17 who were raised in extreme conditions, forced into combat and warfare from a very young age due to the oppression and militarization of their home country. After being liberated by a nation analogous to a Developed Liberal Democracy, they have been given the opportunity to live a normal life in a democratic society. Despite their traumatic upbringing, they are now among the most capable combatants and military minds in the world and are extremely intelligent in the art of warfare and strategy. After living in this free society for half a year, they have chosen to enlist in the military of their new country after their new nation gets dragged into a war with a tyrannical superpower that outmatch the military strength of their new nation. Should the children enlist, they would still have to go to military school all over again until they come of age (since they are all minors).