I don't know who's a kid and who is not, but this artwork definitely sexualizes characters
I say this without any offense. I skimmed through it without reading it so as not to bias my opinion. In the very first scene, the young girl does a series of very impressive gymnastic moves. Yadayada you can immediately recognize the work of a seasoned artist: a superb mastery of anatomy, movement, and a highly effective characterization that portrays the character as passionate, cheerful and interesting overall. Up to this point, there’s nothing sexualized about it. Everything is fine, and it really makes you want to keep reading it. Then she fell into the water, and there was a panel shot from a low angle focusing on how the water drips from her shorts—and specifically on the size of her butt. In this panel, there is no dialogue, no new insight into the girl’s personality: just a heavy focus on her butt. I have no doubt that this work is worth reading, but let’s not lie to ourselves. Girls come in all shapes and sizes (I don't know her age yet), and that in itself isn't sexual. But in the context of a drawing and a story, depicting something commonly viewed as sexual WITHOUT it adding anything to the narrative is definitely a kink on the author's part.

Disgusting comments. They have Dirty mind and blame the Author. Author is just showing his artist skills. Love this manga so much. Every panel is lively