 If you liked
Romeo no Aoi Sora
|
 ...then you might like
Fullmetal Alchemist: Brotherhood
|
Both works feature friendship or close relationship between male characters as an important component. Stories with European backgrounds, touching lines and adventures.
Fullmetal Alchemist is more imaginative and far more serious while Romeo's blue sky was a bit more realistic as it describes the tough life of chimney boys in Europe.