"Natsu no Arashi! Akinai-chū" is a 13-episode anime series that serves as a sequel to the original "Natsu no Arashi!" and continues the story of Hajime Yasaka, a teenage boy who becomes entangled in supernatural events during his summer vacation. The narrative revolves around the Arashiya café, a quaint establishment run by a group of characters with unique abilities tied to time travel. The central figure is Sayoko Arashiyama, a ghost from the World War II era who can travel through time when holding hands with Hajime. This ability allows them to revisit the past and influence events, often to protect the café and its inhabitants from various threats.

The series introduces new characters and expands on the relationships between the existing ones. Jun Kamigamo, Sayoko’s friend and fellow ghost, plays a significant role, as does Kaja Bergmann, a mysterious girl with her own connection to the café. The plot explores themes of friendship, loyalty, and the consequences of altering the past, often blending humor with moments of emotional depth. The café itself becomes a focal point for both the characters and the narrative, serving as a hub for their adventures and a symbol of their shared history.

Throughout the series, the characters face challenges that test their bonds and resolve. These include encounters with rival factions, personal dilemmas, and the ethical implications of their time-traveling abilities. The story maintains a balance between episodic adventures and an overarching plot, with each episode contributing to the development of the characters and their relationships. The tone shifts between lighthearted comedy and more serious, introspective moments, reflecting the dual nature of the characters’ lives as both ordinary café workers and participants in extraordinary events.

The anime retains the distinctive art style and quirky humor of its predecessor while delving deeper into the lore surrounding the Arashiya café and its inhabitants. The interactions between Hajime and Sayoko remain central, with their partnership evolving as they confront new challenges. The series concludes with a resolution that ties together the various narrative threads, providing closure while leaving room for further exploration of the characters’ lives and the mysteries of the café.