Off-duty Japan Self-Defense Forces (JSDF) officer and otaku, Youji Itami, is on his way to attend a doujin convention in Ginza, Tokyo when a mysterious portal in the shape of a large gate suddenly appears. From this gate, supernatural creatures and warriors clad in medieval armor emerge, charging through the city, killing and destroying everything in their path. With swift actions, Youji saves as many lives as he can while the rest of the JSDF direct their efforts towards stopping the invasion.

Three months after the attack, Youji has been tasked with leading a special recon team, as part of a JSDF task force, that will be sent to the world beyond the gate—now being referred to as the “Special Region.” They must travel into this unknown world in order to learn more about what they are dealing with and attempt to befriend the locals in hopes of creating peaceful ties with the ruling empire. But if they fail, they face the consequence of participating in a devastating war that will engulf both sides of the gate.

It was pretty cool, I really liked it, it has a good plot that keeps developing in each chapter, the characters were likeable almost all and they keep growing with each situation.

The scenery is incredible and the human factor is so deep it feels great watching this one, and the political affairs were too good portrayed here too, I liked the theme of moder warfare vs ancient warfare thing, it was well done too.

If you like good plots and interesting character you should be seeing this one.