"Hanasakeru Seishōnen" is a 39-episode anime series adapted from the shōjo manga by Natsumi Itsuki. The story centers on Kajika Louisa Kugami Burnsworth, the daughter of a wealthy industrialist, who is raised in isolation on a private island. At 14, Kajika is brought back to the real world by her father, Harry Burnsworth, who presents her with a mysterious challenge: to identify her future husband among three candidates he has selected. This task is tied to a larger, more complex political intrigue involving the Burnsworth family and the fictional Middle Eastern kingdom of Raginei.

The three candidates are Eugene Alexander de Volkan, a reserved and intelligent diplomat; Rumaty Weller, a cheerful and free-spirited pilot; and Li Ren, the enigmatic and stoic heir to the Raginei throne. Each candidate represents a different facet of Kajika's journey, as she navigates her relationships with them while uncovering the truth behind her father's motives. The narrative explores themes of identity, duty, and love, as Kajika grows from a sheltered girl into a confident young woman capable of making her own decisions.

The political backdrop of the story is significant, as the Burnsworth family's influence intersects with the power struggles of Raginei. Li Ren's connection to the throne becomes a focal point, revealing a web of alliances, betrayals, and hidden agendas. Kajika's interactions with the candidates and her growing awareness of the world's complexities drive the plot forward, blending romance with political drama.

Supporting characters, such as Kajika's loyal butler, Mustafa, and her childhood friend, Takehito, add depth to the narrative. The series balances personal relationships with broader geopolitical stakes, creating a layered story that appeals to fans of both romance and intrigue. The anime concludes with Kajika making a definitive choice about her future, resolving the central mystery of her father's challenge while leaving room for reflection on the journey she has undertaken.