ARCHDEMON'S DILEMMA : HOW TO LOVE AN ELF BRIDE - LIGHT NOVEL (2019) DIGEST-SIZED NOVEL #6

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...