How Not To Summon A Demon Lord Vol. 4

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. 4, the city of Faltra and the elven kingdom of Greenwood are on the brink of war! Shera’s brother, Prince Keera, demands that she be returned to the kingdom, but Shera says that she’d rather stay with Diablo and Rem. However, Keera won’t give up so easily, even if he has to resort to taking her back by force!
Notice: This book is written in Japanese.