User blog comment:B214/High School DxD Hero Discussion/@comment-31035098-20171021090159/@comment-30924344-20171021090650

There is no proof that isn't included and Ishibumi said the studio has been reading the source material very much so I have some hope it will be animated and also due to Ishibumi is in charge basically so that main story point should be included. It sets up Rias's and Issei's confession; hints to it.