Xingye Rin and Xingye Ai are twins. They grew up in an orphanage and always relied on each other. One day, on their way back to the orphanage, they were both killed in a car accident. Together, they transmigrated to the world of killer tennis and became the nonexistent older cousins of Shiraishi Kuranosuke: Xingye Rin, the older brother, and Xingye Ai, the younger sister. At fifteen, they transferred from England to Sakura Country because of their parents' work. Their family is every bit as powerful as the Atobe family.
Their System requires theory to be combined with practice. The older brother is the one who gets put through the practical exercises, while the younger sister controls the process. If they do not practice, the younger sister gets shocked. Because he dotes on her, the older brother immediately decides to join. After working tirelessly day and night, everyone finally realizes that his success has always been due to his sister's support behind the scenes. Their younger cousin has always looked up to Xingye Rin as his role model. When he returns to Sakura Country, he promptly gets his aunt and uncle to agree to let his older cousins join his school, and arranges for his older cousin to become the tennis team's coach.
With Xingye Ai's training, the skills of every tennis team member improve. Write the matches against the various schools in detail. Later, the female lead, Xingye Ai, joins U-17 as its youngest coach. The others refuse to accept her, but with the grit of a Chinese person, all it takes is a good beating to win them over. So on her very first day, she puts her tennis skills and fighting ability to work and gives them all a little workout. After that, everyone secretly calls her the Little Demon.
A story of will-they-won't-they with Atobe Keigo.
At the beginning of the first chapter, the brother and sister were only 10-year-old orphans (they couldn't even leave the orphanage and had no ability to study in depth), but in the second chapter, they turned into "adult thinking in previous lives"?????? Moreover, the female protagonist's data analysis and the male protagonist's ability to understand data analysis are all described according to adult standards, which is completely inconsistent with the background setting at the beginning. If the protagonist was really that powerful and mature, he wouldn't have been bullied so badly in the orphanage in the first chapter and couldn't take revenge and go back. Moreover, after the twins traveled through time in Chapter 1, it can be known that they do not have the memories of the original owners. Even if a pair of smart and gifted geniuses cannot receive adequate education (the orphanage certainly does not have the conditions to provide them with any help, they can only study with those normal ordinary children. If they want to learn more deeply and have access to textbooks for grade 4 and above in elementary school, there is probably no way), they will not have the memories of the original owners. Memory (the memory of the original owner, except for those moments with family and servants, is the memory of education, the most precious to the protagonist is the memory of education, because the original owner is a 15-year-old boy from a chaebol family who received elite education). Even if there is a system, it is impossible for a person with an education level of only the third grade of elementary school to understand those materials. Only an adult genius with at least 18 years of education can understand...