I'm Teppei

Uesugi Teppei and his father live deep in the forest in search of a buried treasure.
Isolated from society, Teppei became a wild child with no restraints until the day his uncle found him.
Teppei finds out that he is actually from a very prestigious family with 5 siblings.
For the first time in his life, he will have to attend school and live under his grandmother's rules.
Can Teppei really adapt to his new environment?