Welcome to Japan, Ms. Elf! Volume 10

Kazuhiro and company successfully hold back Gedovar’s invasion and challenge the third floor master to destroy the ancient weapon their enemies are after. As the invaders seek the means to control monsters, Kazuhiro discovers an unexpected secret. In the modern world, the group decides to take a trip to a ninja-related facility that Eve has been dying to visit. Volume 10 of the hit isekai/modern fantasy series is here!

[From J-Novel Club]