Responses
I have the feeling though, that he only said that for Kazu and not because it was actually like that.
bro are you stupid? reiji was only trying to deny the fact that his father is his grandpa so he wanted kazu to play along because as we all know he cant bare any more pain he would rather fool himself that his mom was lying and kazu knew this. He is basically turning out to be like his mother in these recent chapter, he wants his pain to be shared because its too much for him to the point he would even let his teacher stay around with him,
One thing good finally happened, Reiji confirmed that him and his brother is related by blood