The manga series "It Started with a Kiss" centers on the romantic and comedic dynamics between Kotoko Aihara, a cheerful but academically challenged high school student, and Naoki Irie, a cold and highly intelligent classmate. Kotoko harbors a deep crush on Naoki, though he initially shows no interest in her due to her lack of academic prowess and seemingly frivolous nature. Their lives take a dramatic turn when an earthquake destroys Kotoko’s home, forcing her and her father to move in with the Irie family. This unexpected cohabitation brings Kotoko and Naoki into closer proximity, creating opportunities for their relationship to evolve.

Kotoko’s persistent efforts to win Naoki’s affection form the core of the narrative. Despite her frequent missteps and Naoki’s aloof demeanor, her genuine kindness and determination gradually begin to break through his emotional barriers. Naoki, though initially dismissive, starts to develop feelings for Kotoko, though he struggles to express them openly. The story explores their evolving relationship through a series of humorous and heartfelt moments, as well as challenges that test their bond. Supporting characters, such as Kotoko’s best friend Satomi and Naoki’s younger brother Yuuki, add depth to the story, providing both comedic relief and additional layers to the central romance.

The series balances lighthearted comedy with moments of emotional depth, portraying the complexities of young love and personal growth. Kotoko’s journey from a lovestruck teenager to a more self-assured individual is a key focus, as is Naoki’s gradual softening and acceptance of his feelings. The narrative also delves into themes of family, friendship, and the pressures of academic and societal expectations. Through its engaging characters and relatable scenarios, "It Started with a Kiss" offers a compelling exploration of romance and personal development within the framework of a high school setting.