In the age of fourteen, Cecelia is the youngest to be a Keyblade Master. She keeps in contact with her childhood friend Rika who is mostly with the Seven Deadly Sins, especially at the times she would introduce her older brother Riku to her two half-siblings. At Teiko Middle School, this is where Cecelia was hoping to find her safe haven. She said to herself as she got into one of the buildings: "Holy cow. Just one full day and I'm already being chased down by boys that want to get into my pants." Looking around, she sees that she's in one of the three basketball courts. Picking up a basketball that's nearby, she closed her eyes to get lost in her thoughts for awhile. She recalled one of the many intense games where she sees this team that called themselves the Generation of Miracles. One of the most popular of them all is the ace player known as Aomine Daiki. Making sure that no one is around, she fools around with the ball a bit and dribbles a bit. When she was a kid, she would try to find the nearest basketball court to play. Of course, her father Ryu would join in to play as her mother Sayuri would be on the sidelines to cheer. She's fast on her feet while "traveling" on the ball and her jumps are high enough to toss the ball into the hoop to make up where she can't do a slam dunk. But besides her adapting skills to make up what she lacks, she can shoot the ball into the hoop from either being left-handed or right-handed. After making each successful shots, she's taken aback when she has a gut feeling that she's no longer alone. Turning around, this is when she's in such a shock. Standing a few feet away from her are Aomine Daiki and a boy who's about her height with light-blue spiky hair and light-blue eyes named Kuroko Tetsuya. Aomine Daiki is a young boy with dark skin like Cecelia's but with his short dark blue air and matching colored eyes and appears to be quite a handsome "bad boy" in a way. He said to Cecelia after witnessing her successful shots from both sides: "Hey. You're the new student fro today, aren't you? You sure know how to play basketball around here...take that back. You're the only girl that can play basketball around this school." Cecelia nodded her head and said with the ball in her hands: "Indeed. I'm Cecelia Harumi Miyamoto. You must be Aomine Daiki and Kuroko Tetsuya. I have seen some of your games and I must say that I'm impressed."
Kuroko takes a look at her and said: "What about you?" Cecelia asked, "Hm? What do you mean by that?" Kuroko then answered to her: "Seeing of how well you look, I could only guess that you're involved in some kind of sport if not basketball." Aomine took his turn to talk as he responded: "Now that Tetsu mention it, you look like you're taking some kind of training to maintain in the best of shape and a lot of energy." Cecelia giggled a bit and replied to the boys: "If I tell you of what I would do to maintain my health, you might find it unbelievable." Aomine chuckled with a grin: "Come on. I have seen some great things. Like Tetsu here! He can make some cool passes for the team to get us way in front of our competition." She giggled and then said to Aomine with a modest smile: "Besides going to a few trips with my parents and my cousins, I would learn and train in martial arts. Mainly Kung Fu when growing up." Aomine looked at her with his widened eyes: "Eh?! Are you some kind of a fighting champion or something?! That's awesome!" Kuroko starts to think of something in mind and said: "Hmm...I think I have an idea. It might not be what the school would think about before because it's never been presented. But if your gym classes collide with ours, why don't you play a bit of basketball with us to show the others what you go?" Cecelia said to the boy with the light-blue hair: "Are you sure it's going to work? I'm all up for your idea, but what if it doesn't change anything?" Aomine laughed a bit while patting on her back: "Hah! You'll never know unless you try, right?" Kuroko turned to Aomine and said, "That reminds me. We'll be meeting with Aldera Junior High to compete against them in basketball later." Cecelia spoke up: "Wait...Aldera Junior High? But that's one of the many schools that have students with their powers that they would call t as their Quirks." Aomine turned to the girl and asked, "Huh? Is that what they call it? Well, things just got a little more interesting." Soon enough, Cecelia was introduced to the rest of the basketball team: Kise Ryota, Midorima Shintaro, Murasakibara Atsushi, and Akashi Seijuro. Akashi takes a look at Cecelia and said: "I recognize you from your eyes. Only the recent champion of martial arts to represent Tokyo would have the eyes that are like water." Kise said in shock and awe: "Eh?! You're the famous Cecelia Miyamoto to win for Japan?! That's amazing!" Cecelia got embarrassed, but she's happy to know that she have made six new friends in just one day.