It's more and more clear that murdering the "football kid" really broke Nezumi in the subconscious level no matter the amount of mind manipulation and programming. Ever since that chapter she's been having flashbacks. Maybe it was the first time she was tasked with murdering a child.
Now, what to do with these poor kids. Handing them to the yakuza, especially to fucking Butama of all yakuza groups... As I said previously, my best route would be murdering the whole group, taking the children and raising them in the coutryside with new identities and honest jobs. No more killing. Slow, lovey dovey, peaceful happy life. Midori and her new boyfriend can join too, obviously.