Seirei Gensouki: Spirit Chronicles Vol. 12 (Light Novel)

Vol. 12: Symphony of the BattlefieldWith the Beltrum Kingdom's Royal Guard led by Charles Arbor hot on their trail, Rio is assigned to escort Princess Christina and her party to Rodania. With help from Sara and the others, the group is able to steadily put more ground between them and their pursuers. Meanwhile, Christina reflects on her past and is pained by her inability to apologize to Rio for what happened during their time at the Royal Academy. Unbeknownst to the group, however, Reiss, who has been pursuing Rio and the others from the shadows, begins to move his pawns into place to ensnare them in a trap!
Notice: This book is written in Japanese.