"Girls Bravo" is a romantic comedy manga series that revolves around Yukinari Sasaki, a high school student who has developed a severe fear of girls due to constant bullying by his childhood friend, Kirie Kojima. His life takes an unexpected turn when he is transported to the fantastical world of Seiren, a planet inhabited almost entirely by women. In Seiren, Yukinari meets Miharu Sena Kanaka, a cheerful and affectionate girl who becomes deeply attached to him. After returning to Earth, Yukinari discovers that Miharu has followed him back, and the two begin living together.

The series explores the comedic and often chaotic situations that arise from Miharu's unfamiliarity with Earth's customs and her overwhelming affection for Yukinari. Kirie, who harbors feelings for Yukinari, becomes increasingly jealous and competitive, leading to frequent clashes with Miharu. As the story progresses, more characters from Seiren, such as the wealthy and domineering Lisa Amanogawa and her loyal maid Fukuyama, cross over to Earth, further complicating Yukinari's life.

Themes of cultural differences, misunderstandings, and romantic tension are central to the narrative. The interactions between the characters often result in humorous and exaggerated scenarios, with Yukinari frequently finding himself in compromising situations due to the antics of the girls around him. Despite the comedic tone, the series occasionally touches on deeper emotional moments, particularly in exploring Yukinari's trauma and his gradual growth in overcoming his fear of women.

The manga balances lighthearted comedy with elements of fantasy and romance, creating a dynamic and engaging story. The characters' relationships evolve over time, with Yukinari gradually becoming more confident and open to forming connections, while the girls from Seiren adapt to life on Earth in their own unique ways. The series concludes with a resolution that ties together the various romantic subplots, providing a satisfying end to the characters' journeys.