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Tsubaki Yoshino, a 20-year-old who skipped high school for work, enrolls as a high school student after quitting her job. She meets Wakamiya Kira, a charismatic 15-year-old classmate who once helped her and now knows her true age. Their five-year age gap sparks tension as Kira teases Tsubaki about the challenges of dating someone younger. As Tsubaki adjusts to school life, their playful interactions hint at mutual attraction, complicating her fresh start. The duo’s dynamic unfolds through lighthearted moments and growing affection, setting the stage for a romantic journey.