The news of Kaito's attack on Renji's wife reached Hiroshi's ears, and according to reliable sources, Aira was in critical condition due to severe bleeding. Of course, this was both good and joyous news—if something were to happen to Renji's wife and child, it was highly likely that Renji would take action against Kaito and the Ishikawa family. This situation worked perfectly in Hiroshi's favor, as his plan to destroy Kaito was progressing smoothly without him having to dirty his own hands.
Kaito Ishikawa was strong, straightforward, and cold—but also foolish. Hiroshi thought so for a reason: Kaito was easily provoked and manipulated. This was proven when he invaded the house of Renji without considering the devastating result of his actions, which would ultimately consume him and the Ishikawa clan. Renji would certainly exact revenge.
