"Tada-kun wa Koi o Shinai" is a romantic comedy anime that centers on Mitsuyoshi Tada, a high school student with a passion for photography and a seemingly unshakable indifference to romance. Tada's life takes an unexpected turn when he encounters Teresa Wagner, a foreign exchange student from Luxembourg who has lost her way in Japan. After helping her, Tada introduces Teresa to his close-knit group of friends, including the energetic Hajime Sugimoto, the stoic Kaoru Ijūin, and the cheerful Hinako Hasegawa. Teresa quickly becomes integrated into their circle, bringing a fresh dynamic to their interactions.

As the story progresses, Teresa's presence begins to subtly influence Tada, who has long believed himself incapable of falling in love due to a past experience. The narrative explores their growing bond, as well as the relationships and personal struggles of the supporting characters. Hajime harbors unspoken feelings for Tada, while Kaoru and Hinako navigate their own complex emotions and friendships. The series balances lighthearted moments with deeper emotional undertones, particularly as Teresa's time in Japan is limited, adding a sense of urgency to her connection with Tada.

The plot unfolds through a series of episodic adventures and heartfelt conversations, gradually revealing the characters' backstories and motivations. Tada's passion for photography serves as a recurring motif, symbolizing his desire to capture fleeting moments and preserve memories. Teresa's cheerful and curious nature contrasts with Tada's reserved demeanor, creating a compelling dynamic that drives the narrative forward. The series concludes with a resolution that ties together the characters' arcs, emphasizing themes of friendship, self-discovery, and the transformative power of love.