Bokura no, Higurashi no Naku Koro ni Kai Recommendations
These series aren't alike at all really. But at the same time there is something that sort of reminds me of the other. While in Higurashi the characters are close they aren't so much in Bokurano. There is an hanging feeling of hopelessness and despair in Bokurano because of what happens to the pilots of the Zearth the same hopelessness and despair is easily found in Higurashi too.