Justified in that When They Cry is the franchise title, also encompassing Umineko: When They Cry and all spinoffs of both. Higurashi: When They Cry got this treatment too, its manga being released under the name "Higurashi: When They Cry" (although this example is less redundant than most since 'higurashi' means 'cicada(s)') and the anime released as "When They Cry: Higurashi no Naku Koro ni" (which is redundant right there).
For example Seirei no Moribito roughly means "Guardian of the (Sacred) Spirit", so the English-language title is Moribito: Guardian of the Spirit and Bokurano means "Ours" (or if you want to get really literal it means "of us") so VIZ Media is releasing the manga as Bokurano: Ours.