Outbreak Company: Volume 9 by Ichiro Sakaki

So you’ve got the Eldant Empire, a fantasy world somehow connected to Japan by a mysterious “hole.” And you’ve got Kanou Shinichi, general manager of Amutech, a company whose whole purpose is to promote cultural exchange with this new land—using otaku stuff! Shinichi’s father is a master at churning out popular light novels, but then word reaches Shinichi that his dad’s series has been put on indefinite hiatus. Shinichi may have kept his family at arm’s length in his days as a shut-in, but he can’t ignore this, and makes plans for a visit home. His Eldant friends, worried that this is another ploy on the part of the Japanese government, convince the JSDF to let them send Myusel and Elvia along as bodyguards. Call it the first Eldant embassy to Japan—and they have a lot to learn. An unexpected interloper, a series of accidents, and more international [interdimensional?] intrigue are waiting in the wings for Shinichi and his friends!