 If you liked
Hyouryuu Kyoushitsu
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 ...then you might like
7 Seeds
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Both are about a group of people being 'brought' to post-apocalyptic future. In Drifting Classroom, they got transported to the future. In 7seeds, they're put into cold sleep and released in unknown number of years later.
In Drifting Classroom, the earth is like a desert wasteland, no fruits/plant/animal that they could eat, no sea/ocean. While in 7seeds, the earth is still changing, some living things like plants evolved, so there're still edible food that they can find, and there're sea/ocean.