Chris Beveridge from Mania Entertainment considered the OVAs to have better quality than the TV series, mainly because they were developed by Production I.G instead of Bee Train and because they have a darker storyline.
Крис Беверидж признал, что качество серий OVA превосходит аниме, в частности потому, что серии были созданы на студии Production I.G вместо Bee Train.