"Hatena Illusion" is a 12-episode anime series that blends elements of fantasy, romance, and mystery. The narrative centers around Makoto Shiranui, a young aspiring magician who dreams of following in the footsteps of his late parents, renowned stage magicians. His life takes a dramatic turn when he encounters Kana Hoshisato, a girl with a mysterious past and a connection to his family. Kana possesses a unique ability tied to the "Hatena," a magical artifact capable of granting wishes but at a significant cost. This artifact becomes the focal point of the story as its powers attract dangerous individuals seeking to exploit it.

Makoto and Kana form a partnership, with Makoto aiming to protect Kana and uncover the truth behind the Hatena while pursuing his dream of becoming a great magician. Their journey is fraught with challenges, including encounters with rival magicians, shadowy organizations, and the moral dilemmas surrounding the use of the Hatena's power. The series explores themes of ambition, sacrifice, and the consequences of wielding extraordinary abilities, all while maintaining a lighthearted tone through comedic moments and the budding romance between the protagonists.

The supporting cast includes Mei Ayakura, Makoto's childhood friend and fellow magician, who provides both emotional support and a source of rivalry. Additionally, the enigmatic figure of Souya Hoshisato, Kana's older brother, plays a pivotal role in the unfolding mystery, as his motives and connection to the Hatena remain ambiguous. The interplay between the characters drives the narrative forward, with each episode revealing new layers to the central mystery and deepening the relationships between the protagonists. The series concludes with a resolution that ties together the threads of the story while leaving room for interpretation regarding the future of its characters.