 If you liked
Zombie-Loan
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 ...then you might like
Hatenkou Yuugi
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Two guys and one girl going from place to place looking for trouble and getting out of it in both anime. They both leave you with somewhat an unfinished feeling and thought of bigger story behind it. Both have supernatural elements and somewhat similar characters.
Hatenkou Yuugi is a bit more darker do, but they are both lighthearted to watch and finish.