Give me a good reason why you're not watching this, Beast's Lair.
Spoiler:
It's only a few episodes in so far into the airing, and though the setting is initially clearly derivative for anyone with a familiarity with anime (Artificial Pacific Island? Check. A city tailor made for students almost exclusively? CHECK.) that doesn't matter a mote because the treasure hunting shenanigans and the eccentricities of the cast carry the show just fine through what could have been a potentially mediocre slog of a start.
It's based on a light novel, so there's an obvious risk of spoilers here. Just tag and bag 'em accordingly, and there'll be no fuss.
Everyone's great, but if I had to pick sides so far then Tensai for the cup. Juugo's fun as hell, too. Second best protag this season only to Sora from No Game No Life.