Magic in this Other World is Too Far Behind! (Manga) Volume 12

Upon finding his childhood friend Kuchiba Hatsumi in the other world, Suimei sneaks into the Miazen palace to meet her. But Hatsumi has lost her memory, and a clandestine rendezvous breaks down into an unwanted battle against the hero's entire party. Alone and surrounded inside a hostile stronghold, the modern magician must wield his might in order to make it out alive!