Ouji-sama no Hanryo wa Batsuichi Arafou

Tatsumi Yagasaki, a corporate writer who is tired of life, is assigned to help Prince Nico of Rasheed Kingdom, who came to Japan to produce a guide book about it. Following the prince around everyday made Tatsumi very tired but he was touched by seeing Nico's sincere smile. When he woke up the next day he realized that he and the prince had a one-night stand. Tatsumi was afraid of punishment by death or worse, until he saw Nico was happy but embarrassed about it. But because of the traditional custom of "spending your life with the person you gave your virginity to", Tatsumi is forced to become the prince's "consort"! A love story that transcends the social status and nationality between a royal prince and a divorced 40-something salaryman!

(Source: Hanaoto, translated)

Note: Chapter count includes an additional one-shot.