If you're looking for manga similar to Cocktail Prince, you might like these titles.
Depicts the whimsical adventures of human personifications of national holidays on the Japanese calendar. Focusing on gags that are tied to stereotypes and images typically associated with holidays in Japan, like "New Year's Day" is a traditional Japanese individual, "Coming of Age Day" likes to drink, and "Valentine's Day" is an unrepentant casanova.
Second-year high school student Sou Kagaya appears to be a charismatic kid on the surface, but is actually shrewd and calculating on the inside. His life changes when he meets Asahi Nagamine, who lives at his own pace without caring about what people think. What challenges are in store for this mismatched couple’s first love?