Nitta Youka: Secret diplomacy
Manga: Secret Diplomacy (Koushi Kakka no Himitsu Gaikou or The Secret Diplomacy of a Minister Excelency)
Mangaka: Youka Nitta
From Bakaupdates: Yoshinaga's genius and his gift for political maneuvering have helped him ascend to the higher spheres of the Ministry of Foreign affairs at an early age. As for Shiraishi, the prestige of his family as well as his dedication to his job has also led him to an early career in diplomacy. Yoshinaga is Shiraishi's future brother-in-law as he is soon to be married to his sister. When the two meet in Thailand, a stunning tale of love unfolds.