User blog comment:Crimson and Darkness/DxD Updates 2~/@comment-27083298-20170929160908/@comment-26926813-20170930183535

Ishibumi also mention that Issei will have fight with Tobio in volume 24:

Text of the Twit:

まあ、２４巻でイッセーと鳶雄が本格的に絡むのでよろしくお願い致します.