The World's Finest Assassin Gets Reincarnated in Another World as an Aristocrat

Lugh heads to the neighboring kingdom of Swoigel. Once a month, he travels to the Viekone region in order to visit Dia. During his visit, together Lugh and Dia develop new spells. Meanwhile, left back home by themselves, Tarte and Maha hold a tea party together. While Lugh is gone, they have a fun time preparing a special meal together, but--