A ghost only you can see won't stop pestering you about a briefcase that turns your house into a war zone. Tomoharu just wants to graduate, but the show doesn't care what he wants. Every faction hunting him has a piece of a bigger secret, and watching him scramble to survive while his dead best friend cracks jokes in his ear creates a friction that carries the whole thing, Misao's presence keeps the mood from getting too heavy, but he also reminds you that someone important is already gone. The mechas feel earned rather than inevitable. This is a show that understands how to stack problems on top of a normal kid until something has to break.

Tomoharu is an ordinary high school student with one unusual trait: the ghost of his childhood best friend, Misao, stays at his side. After he moves into his brother's old house, he is left with a locked, mysterious briefcase and no instructions for it. He means to leave it in storage, but several groups soon break into his home looking for it, among them a number of female occult users. Still ignorant of what the case is for, Tomoharu escapes with it alongside Misao. He then tries to uncover its secrets, how it ties to Misao, and why it holds the power to change the world. This supernatural mecha action series is adapted from a light novel series.