 If you liked
Mikai no Hoshi
|
 ...then you might like
Arigatou
|
While Arigatou is a story about a family on the verge of collapse in Japan, Mikai no Hoshi setting is an uncivilized planet during wartime. The settings might be drastically different but they both depict pretty brutal relationships and graphic sexual scenes. Mikai no Hoshi's are more violent and mostly rape though.
Basically, while reading any of these you step into dystopian worlds of pain where you just want the protagonists to endure their hardships and be happy while at the same time suffer from their stupid decisions. The other important similarity is how these manga also have positive messages despite all the suffering.