Ever since Shibuya Yuri came to the Real Demon Kingdom, he has been inseparable from the beautiful but hot-tempered third prince of the former Demon King Paul Ram.
He never thought that he would be engaged to a prince, because... The prince is a boy... And advantageously, he is also a boy!
………………
When Shibuya Yuri doesn't know how he feels about his same-sex fiancée, a love rival appears? Moreover, this powerful love rival turns out to be beneficial to himself? !
Note: This article is a derivative story of the anime "The Demon King Begins Today" and is closely related to the plot of the original work. If you have not read the original work, you may feel that the plot of this article is fragmented.