 If you liked
Shingeki no Kyojin
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 ...then you might like
Stravaganza: Isai no Hime
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Both manga have similar stories in which humans enclosed themselves in giant walls to protect themselves from the danger outside the walls.
In Stravaganza, beyond the walls there are many dangerous monster that devours human but at the same time there are some that are just passive.
While in Shingeki, There are giant monster that resembles human that seems to have not much of a mind but eating humans. Also, The atmosphere of both of these manga are different, Shingeki has a dark atmosphere while Stravaganz has more of a lighter one.