>>280105220
It's happening because Reiji fell in love with money and won't kill it until it's still profitable, which it probably isn't anymore, at least for Kodansha.
As for the story he wrote himself into a corner by writing Chizuru like a bitch all throughout the story, he can't go back on that. The manga will end the exact second they get together, so he won't have to compromise Chizuru's character. Also ironically the story is more compelling if Kazuya fails.