After losing his parents in a freak accident, high schooler Tatsumi Tatsunami is doing his best just to get by and provide for his younger siblings. But his life gets a whole lot more complicated when he’s attacked by aliens! Saved by a mysterious man named Sharaku who belongs to the even more mysterious organization called Foreign Affairs 5, Tatsumi will have an important decision to make if he wants to figure out why these aliens are after his life!