Riches and Bitches: I have a gate to an isekai and leveling-up system!

"Be better" Peter was cursed by those words, the very last words of his dying mother. Cursed to be better. To be above the small squabbles... And so, the last five years of his childhood, he spent as a target of bullying, both in school and in his adoptive, step-family. But it all changed, when a portal to another world appeared in the middle of his shed! ***** Every supergift (castle or above) = 3 bonus chapters