Im looking for a manga about a boy who is not originally popular but then takes advice from his sister otome games to become a prince like figure.he visits a cafe with a really cute waiter a lot to test out his new "skills"[spoiler] it has a seemingly nice guy who turn out to be demon like, and really pretty men. its a yaoi and ive been looking forever any help?

Best Ending? by Mio Junta?