Apparently, he's one of the most well-developed kids in his class. Series Page 1

ORECS-731 Hinata and Mei are apparently among the most well-developed girls in their class.

ORECS-730 Akari and Ran are apparently among the most well-developed girls in their class.

ORECS-729 Arisa and Reimi are apparently among the most well-developed girls in their class.