7 Seeds

They talked about people who lived in the future when they aren’t people except them they also talked how to rebuild the earth and human civilization 

it is similar to the way where both of the anime is about surviving on an isolated land or island. if you liked then definitely you will 7 seeds. In my opinion, both anime are so strong in the story side view.  

Similar to The Promised Neverland, the cast of 7SEEDS are unknowingly put in a situation designed for them.  

Survival in futuristic dangerous terrain. Lots of adventure and adapting to new circumstances. 

Surviving after the world has changed forever. 

Lots of characters, put in an unknown environment trying to survive. There is lots of flash backs. 

Multiple character’s have questionable cynical evaluations of people in 7 seeds much like million lives mc’s extreme pessimism and almost stoic evaluations of what a human life is worth. Both feature a world ending plot point as seen within the first 2 episodes of both series and unsurprisingly shows a semi realistic representation of human nature with the occasional betrayals, murders and devious tricks  

Both Koutatetsujou no Kabaneri and 7 Seeds are set in a world where civilization as we know it ceased to exist due to some catastrophe. The main characters are bound to fight for their survival in one way or another. Moreover, the humans are threatened not only by the dangers of the post-apocalyptic world but also the hatred among themselves. The subliminal topic of both stories is the corrupted morality of the rule that "strong live and weak die". 

both anime talk about surviving in the worst scenario by an humanity and good decision. If you like 7 seeds then definitely you will like Xankuou no Terror.  

There is not much connection to be made from just looking at both of these anime at a glimpse but they are very similar. I can't say exactly how they are related because of spoilers, but the overall concept of 7 Seeds is loosely based on something presented in Trigun. 

How the main characters evolve in the both series are similar where both of the series talks about how life is more about humanity and not stick with rules that played in surviving from a decision that might you need to kill the others for the purpose of staying alive.  

Coping after a natural disaster event. Both seem quite straightforward on the surface but take the time to explore complex interpersonal relationships and have mature themes. 

both wake up in an island surrounded by insects with no other choice but to fight and survive 

Both anime have similar critiques on humans a species. Is it possible for us to act in the best interests of the human race? Or are self and familial connections more important? The general thesis of each series is "the ends justifies the means", no matter how horrible the journey. 

Similarities : - both are survival anime in deserted island/world - characters have amnesia . don't know wtf happened to world after waking up - have to fight off strange creatures in order to survive - lots of guessing and mindgames on who is good or bad in the team - solving mysteries and helping each other to survive - honestly if you like survival + thriller animes, definitely give these 2 a try they are soo similar Differences: - One is japanese and the other is chinese 

I think if you like 7 seeds then definitely you will like highschool of the dead, bot anime have strong stories and string characterize.