Nanami Series by Éric Corbeyran, Amélie Sarn, Nauriel

When Nanami, a bored adolescent living life on automatic, finds a strange book that appears to be “inhabited," she tracks down the book’s owner only to be introduced to something even stranger: a theatre troupe whose members get projected into a parallel universe during rehearsal. The universe in question is the thrilling and romantic — but dangerous — world in which their play is set and in which wallflower Nanami becomes a warrior princess fighting for her life and her kingdom.

In this second gripping volume, Nanami grows more comfortable in her role as warrior princess in a parallel world that only appears when she and her fellow actors start rehearsing their play, but the pressure on her is building from all sides: she must fight ever greater threats in the Invisible Kingdom, her parents are on her case, her nemesis at school won't stop pestering her, her best friend feels left out, she's lost the magical book entrusted to her, her cat's gone missing, and a... moreIn this second gripping volume, Nanami grows more comfortable in her role as warrior princess in a parallel world that only appears when she and her fellow actors start rehearsing their play, but the pressure on her is building from all sides: she must fight ever greater threats in the Invisible Kingdom, her parents are on her case, her nemesis at school won't stop pestering her, her best friend feels left out, she's lost the magical book entrusted to her, her cat's gone missing, and a mysterious stranger asks her for a very dangerous and very forbidden favor... less