 If you liked
Hoshi no Koe
|
 ...then you might like
Black★Rock Shooter (OVA)
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I thought Black Rock Shooter was very similar to Voices of a distant star. For one, the art was interesting. But story plot wise, They were both about people that were good friends and something took them away from eachother. In Voices of a Distant Star, it literally was distance and in Black Rock Shooter, another character took them apart. They both had quit a bit of action in them too as well as being sad.