How Not To Summon A Demon Lord Vol. 12 (Light Novel)

Takuma Sakamoto is a hikikomori gamer who never leaves his room until one day he is suddenly transported to another world that is just like his favorite MMORPG, Cross Reverie, as his character from the game, Demon Lord Diablo! Turns out he has been summoned by pantherian Rem and elf Shera who wish to make him their slave, but thanks to his passive ability “Magic Reflection,” the spell backfires and they end up his slaves instead! To compensate for his social anxiety, he decides to role-play as Diablo while using his knowledge of the game and ridiculously high stats to survive. With Rem and Shera at his side, he begins traveling and making a name for himself as the “Demon Lord from another world”!
In Vol. 12, though he has taken on a quest from the King of Lyferia, Diablo ends up befriending the target kobolds he was meant to dispatch, putting him into conflict with the kingdom. However, the situation drastically changes overnight when the Gelmed Empire declares war! The overwhelming strength of their powerful magical weapons called Magimatic Sols cause a remote fortress city to fall. Meanwhile, Diablo finds himself in a different crisis when Shera tells him that she saw what he did the night before with Solami!
Notice: This book is written in Japanese.