Disclaimer: Let's see... Am I fluent in Japanese? No, I don't own Katekyo Hitman Reborn.
Kokomi grew up as a normal girl. She had slightly higher than average academics, but it averaged out with slightly lower than average athletics. She lived in Namimori, a peaceful town because the head of the Disciplinary Committee (Isn't that in schools? Not an organized thing for the town?), Hibari Kyoya, bites anyone who disturbs the peace to death.
She took karate and judo and is now a blue belt in both. Though Kokomi dabbled in kendo, she only knows a little bit. Kyoko actually was the one who made her take self-defense classes, claiming they were to "prepare her for the future just in case."
Kyoko always took good care of her daughter, though never too overprotective, she let her learn. Remembering how Tsuna used to be, she tried to keep Kokomi away from that example. They had good times.
Kokomi was always excited for her dad's visits. Although normally sporadic, he always came back on her and her mom's birthdays.
"Daddy!" She would squeal. Then, she'd leap into Tsuna's arms, so he'd pick her up and swing her around.
"Tsu-kun! Careful! You'll drop her!"
"Kyoko, I'm not that useless. I can take care of myself and my child." He snuggled Kokomi causing a sugary giggle to erupt from her.
"Well, you better not revert to your old habits from when we started middle school."
Remembering his days of Dame-Tsuna, Tsuna felt his face getting hot, a very red blush crept onto his cheeks. "Th, that was then, and this is now. I won't be that clumsy anymore."
"Yeah! Daddy's not so bad anymore!" Kokomi chimed in.
"Okay, okay you two. Come in already so we can have some cake." Kyoko ushered the pair in, taking them to the table.
A 12" cake smothered with chocolate frosting sat on the table. "Happy Birthday Kokomi!" Was spelled out in curly letters. 4 candles sat upon the chocolaty goodness, lit with orange flames.
"Three for three happy years so far..."
"...and one for good luck!" Kokomi smiled so innocently. "I'm gonna blow them out with my dying will, right daddy?"
Tsuna looked questioningly at Kyoko who just smiled. Kokomi's eyes were shut and her little puffed cheeks were blowing with all their might. She only successfully blew out three candles, but she tried again and finished the fourth. With her looking so elated, the couple just had to smile.
After a few more hours of having fun, Gokudera came in.
"Juudaime, we have to go now. There's something we have to do." Tsuna had some kind of pained look in his eye, but he reluctantly went.
"Sorry Kyoko, I have to go now."
"You always have." She had a biting tone, but let him go.
Those were the good days. The days of happiness that she may never get back.
So the description told of Kokomi's life was up until her 7th birthday which will be next chapter. The story part was obviously her 3rd birthday.