Fuminori Teshima 
An Archdemon’s Dilemma: How to Love Your Elf Bride (Manga) Volume 3 [EPUB ebook] 

It’s Lonely at the Top!

Upon inheriting the Sigil of the Archdemon, Zagan suddenly thrusts Nephy away from his side. The distance between them was gradually shrinking, so why the sudden change? And who’s this guy attacking the local tavern? The one pulling the strings behind the curtains finally reveals themself and chaos ensues as the truth begins unravelling.