I Was Sold Dirt Cheap But My Power Level Is Off the Charts is a fun isekai manga involving mecha. Since the first day of school, Yuta has been waiting for the annual class trip to reveal his feelings to the girl he likes. That's enough to make anyone nervous, but then the day goes into a completely unexpected direction. Everyone in the class trip is summoned into another world where they're referred to as ¡ÈEarthlings.¡É And now the Earthlings are going to be slaves.

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https://otakuusamagazine.com/i-was-sold-dirt-cheap-but-my-power-level-is-off-the-charts-is-a-fun-isekai-manga/