"Natsu no Arashi!" is a supernatural comedy-drama anime series set in a small Japanese town during the summer. The story centers around a 13-year-old boy named Hajime Yasaka, who stumbles upon a mysterious café called Ark while seeking shelter from the rain. There, he meets a beautiful and enigmatic girl named Arashi, who works as a waitress. Hajime soon discovers that Arashi is not an ordinary girl but a ghost from the World War II era, trapped in the present day due to unresolved emotions tied to her past.

Arashi possesses the ability to travel back in time when she holds hands with someone, a power that becomes central to the narrative. Hajime becomes her partner in these time-traveling adventures, and together they explore Arashi's past, uncovering her connections to the war and the people she left behind. The series intertwines moments of lighthearted comedy with poignant reflections on loss, memory, and the passage of time.

The café Ark serves as a gathering place for other characters, each with their own quirks and backstories. Among them is Sayoko, Arashi's best friend and fellow ghost, who also hails from the same era. Sayoko’s playful and mischievous personality contrasts with Arashi’s more reserved demeanor, adding depth to their dynamic. Other characters include Jun, a café regular with a sharp tongue, and Kaja, a young girl who becomes involved in the group’s adventures.

As the series progresses, the time-traveling escapades reveal more about Arashi’s life during the war, her relationships, and the circumstances of her death. These journeys into the past are not only about uncovering historical truths but also about helping Arashi come to terms with her unresolved feelings. The narrative balances episodic adventures with an overarching plot, gradually building toward a resolution that ties together the themes of love, sacrifice, and the enduring impact of the past on the present.

The interplay between the characters, their interactions with the supernatural elements, and the exploration of historical events create a unique blend of humor and emotional depth. "Natsu no Arashi!" uses its time-traveling premise to explore both personal and collective histories, offering a story that is as much about human connections as it is about the mysteries of the past.