>>280481255
Apparently the newest volume of Haibara's NG+ has an If side story at the end where Natsuki who never regressed meets Miori again as a still single adult in their late 20s, they both confess their love to each other and start dating with the intention of marriage. So if volume 6 didn't already make it obvious the CF got completely quantum NTRed by Natsuki's regression.