[Prince of Tennis] A Starry Miracle

On his fifteenth birthday, Atobe Keigo suddenly receives a mysterious letter. [To Atobe Keigo Happy 15th birthday. Here is your birthday present, an important warning from the future: Keep a close eye on your classmate, Naruse Hoshizora. This woman will ruin your life. From Atobe Keigo, age 25] At first, Atobe thinks it's just a prank. But gradually, he starts to realize that his classmate, the financially struggling scholarship student who always wears a silly smile, is a little cute, speaks with an upward lilt, and seems so ordinary, isn't quite what she appears to be. Because... "Amazing, Naruse got full marks on her math test again." "Hehe, I didn't really study much." "Congratulations, Naruse, on winning the national junior high school physics competition." "Hehe, I was just lucky." "Naruse, you can really eat, can't you?" "Hehe, the sign says you eat for free if you finish eight bowls." "Naruse, you just broke the record in the 1,000-meter race." "Hehe, I wanted to finish quickly so I could play games." "Naruse, damn it, why are you so good at video games too?" "Hehe, I guess I saw through the game's tricks." This woman... Atobe Keigo folds his arms and watches Naruse Hoshizora's slender back as she walks past him. The corner of his mouth twitches, and he says to Oshitari Yuushi beside him, "I really don't care about her at all." Oshitari: "Mm..." Premise: Youth.