"Tsukiuta. THE ANIMATION" is a 12-episode anime series that revolves around the lives of male idols associated with the fictional talent agency, Tsukino Productions. The story is structured around the concept of six idol units, each representing a different month of the year and embodying unique themes and characteristics tied to their respective months. These units—Procellarum and Six Gravity—are central to the narrative, with their interactions, rivalries, and personal growth forming the core of the series.

The plot begins with the introduction of the two main groups: Procellarum, representing the months with 31 days, and Six Gravity, representing the months with 30 days (plus February). Each group consists of six members, and their dynamics are explored through a mix of slice-of-life moments, comedic interactions, and light drama. The series delves into their daily lives, rehearsals, and performances, highlighting their struggles and aspirations as idols. While the overarching narrative is episodic, it gradually builds toward a climactic joint concert where both groups must come together to showcase their talents and resolve underlying tensions.

Key characters include the members of Procellarum: Koi Kisaragi, Haru Yayoi, Aoi Satsuki, Kai Hazuki, Yuu Nagatsuki, and You Haduki. Each member has a distinct personality and backstory, with Koi often serving as a central figure due to his cheerful and determined nature. Six Gravity is composed of Shun Shimotsuki, Rui Kisaragi, Arata Kanna, Kakeru Shiwasu, Hajime Mutsuki, and Yoru Kagerou. Shun, the leader of Six Gravity, is portrayed as calm and responsible, contrasting with the more energetic and mischievous members of his group.

The series balances lighthearted moments with deeper themes of camaraderie, self-discovery, and the challenges of pursuing dreams in the competitive world of idol culture. While the narrative does not delve heavily into dramatic conflicts, it emphasizes the importance of teamwork and mutual support among the characters. The anime also incorporates musical performances, showcasing the groups' talents and adding a vibrant, energetic element to the story.

Overall, "Tsukiuta. THE ANIMATION" offers a character-driven narrative that focuses on the relationships and growth of its idol protagonists, set against the backdrop of their shared passion for music and performance. The series appeals to fans of idol anime, providing a mix of humor, heartwarming moments, and musical entertainment.