From BD vol.2 Booklet;
Akiyuki Shinbo: 'I will don't know if I will be able to create a work like this ever again, during my life time'
As a fan, this words left me quite a lot of impressions.... ;_;
He also said stuffs that he spent really hard time working on this series, due to
evil Urobuchi dark and depressing atmosphere that the show had (he said he couldn't handle its depression as well as he did when he was young).