@IronClad
Before Tsutomu was a wet blanket who was as needlessly cautions as the plot needed him to be to prevent Birdy from actually trailing suspects. Now he's just a vengeful psychopath who doesn't care about consequences, especially to Birdy, which is what irks me most about this series. In all other versions, Tsutomu and Birdy became sympathetic towards each other and bonded as friends, but here it seems Birdy is the one going out of her way to help him while he just wavers.
"Let's go rescue Chigara! Nevermind, he's probably okay."
"Don't be so reckless Birdy, we can chase them later. WHY DIDN'T YOU CHASE THEM BEFORE?!"
"Sucks that your surrogate mother died. Oh well, time to study."
He doesn't grow as a character, he just has mood things when things affect him personally.
And ironically, this is the part in the story where Nakasugi stops being dead weight.