An Archdemon's Dilemma: How to Love Your Elf Bride Series by Fuminori Teshima

Zagan is feared by the masses as an evil sorcerer. Both socially awkward and foulmouthed, he spends his days studying sorcery while beating down any trespassers within his domain. One day he's invited to a dark auction, and what he finds there is an elven slave girl of peerless beauty, Nephy. Having fallen in love at first sight, Zagan uses up his entire fortune to purchase her, but being a poor conversationalist, he has no idea how to properly interact with her... moreZagan is feared by the masses as an evil sorcerer. Both socially awkward and foulmouthed, he spends his days studying sorcery while beating down any trespassers within his domain. One day he's invited to a dark auction, and what he finds there is an elven slave girl of peerless beauty, Nephy. Having fallen in love at first sight, Zagan uses up his entire fortune to purchase her, but being a poor conversationalist, he has no idea how to properly interact with her. Thus, the awkward cohabitation of a sorcerer who has no idea how to convey his love and his slave who yearns for her master but has no idea how to appeal to him begins. less

Zagan and Nephy's clumsy cohabitation continues! As they're enjoying their time together, a sorcerer coveting the power of an Archdemon comes charging in, covered in armor from head to toe. Zagan easily repels them, but finds that they're a young dragon girl named Foll. Meanwhile, the church has brought over an Angelic Knight who's rumored to have even killed a dragon to tackle the newly crowned Archdemon.. moreZagan and Nephy's clumsy cohabitation continues! As they're enjoying their time together, a sorcerer coveting the power of an Archdemon comes charging in, covered in armor from head to toe. Zagan easily repels them, but finds that they're a young dragon girl named Foll. Meanwhile, the church has brought over an Angelic Knight who's rumored to have even killed a dragon to tackle the newly crowned Archdemon... Will our awkward Archdemon and elf ever close the gap between them, or will all the commotion get in their way!? less

The castle has become lively with the addition of a butler and a daughter, and as Zagan and Nephy's awkward days continue, Nephy is suddenly attacked in town. And the one who attacked her... is a girl who looks identical to Nephy, but with dark skin?! Immediately following that incident, Zagan receives an invitation from an Archdemon to an evening ball on a boat?! The residents of Zagan's castle head off toward a luxurious party, fully aware of the danger!

Zagan's group heads off to Nephy's hometown in order to learn more about high elves. However, when they arrive, they get trapped in a barrier that distorts time! While they're in there, Zagan's beloved bride Nephy is... turned into a little girl!? The precocious little Nephy is cute in her own right, but there's no way Zagan can just leave her be! Will Zagan and the others find the culprit behind Nephy's curse before it's too late?

Nephy and Zagan have finally confessed their feelings to each other, but neither of them have any idea how to act like a normal couple. After getting some advice, Zagan finds out about a mysterious event know as a 'date,' and goes on a research trip in town where he coincidentally saves the blind therianthrope, Kuroka, a newly dispatched priest. At the same time, Nephteros discovers the truth of her origins and escapes to Zagan's territory while being pursued by Bifrons' chimera.

Zagan and the others turn Foll older temporarily to help her grow stronger. However, the ritual goes berserk, and when Foll grows bigger, Zagan shrinks! Following Orias' advice, they decide to attend the Continental Interracial Elders Conference in the Far-East in order to obtain powers aside from sorcery. What awaits them there is a member of the Night Clan, beings who live eternal lives, Alshiera. And somehow, this girl they meet for the first time seems to know Zagan and Nephy...