A Witch's Printing Office Series by Mochinchi, Yasuhiro Miyama

What nerd wouldn't enjoy exploring an RPG-style world? Not Mika Kamiya! She was just about to enjoy her post-Comic Market haul when fate whisked her away to a fantasy land. All Mika wants is to find a way home, so she's hunting for spells-but rather than search all over, they'll be coming to her to attend her magical-book-selling event, Magic Market! With a very "animated" catalog of guests, eccentric attendees, and out-of-control lines, what could possibly go wrong?!

Dragons, typhoons, and demon lords, oh my! The popularity of Magic Market has boomed beyond expectation-in fact, it's such a hit, news has reached even the highest echelon of the underworld. As the Holy Land teems with all manner of human and monster, will Mika be able to keep order and find a way back home, or will chaos ultimately reign under the arrival of the Demon Lord?!

Mika's massively popular magic-focused event "Magiket" has grown again, continuing to bring her spells and mages from around the world-and also boatloads of work...But despite her Market's ever-increasing reach, a surprise encounter comes from outside Mika's purview! The last thing she expected was to meet another Japanese visitor-could this transplant also be seeking a way home?

Protagonist Press is as busy as ever, thanks in part to Mika’s hugely successful Magic Market bookselling event—from magic-decrying warriors to tiny, meddling fairies, people from all walks of life are dipping their toes into the wonderful world of magical tomes. Despite the ever-growing size of Magiket’s crowd, the Prep Committee has the chaos well under control...until its faithful venue is suddenly double-booked, dumping Mika into a whole new crisis!

A mysterious person familiar with the origins of Protagonist Press' employees Kiriko and Yamamoto and with Mika's background has appeared. But they're really an assassin sent by a faction posing a threat to the Magic Market! After investigating Mika's past before she started up Protagonist Press and judging her as dangerous to the world of magic, they have been entrusted with a mission to kill her! While Mika herself is unaware, the threat to her life nears ever closer in volume 5!

After solving the mystery of why humans around the world became unable to use magic, Mika finds...the definitive information she needs return to her original world?! Mika takes on the final Magic Market with a sense of fulfillment, but an unexpected situation awaits her …