A girl who lives in the most ordinary place but is full of miracles is extremely disgusted with the pulling boy, but he is just an illusory character. The girl who was also a regular member of the school tennis team casually "swore an oath" that if she met him, she would beat him fiercely. Unexpectedly, an unintentional word became the beginning of everything, whether it was an unexpected and bloody time travel, or a fateful meeting. In this strange world of tennis, can girls carve out their own niche in tennis? In the final head-to-head confrontation, after a long period of hard training between the two, who is the ultimate winner? Will feelings sprout among them? People from two different worlds are troubled by everything. What will be their ending?