The sister was surprised when he caught her in the date, I don't think that he pimp her out. She dates older men and he "rescue" her. She probably dates older men for sustaine the youngest brother on her own and not on good hearts, maybe just to control him (like she controlled the guard)
I mean the art style isn't bad but it didn't seem like she was stunningly beautiful compared to the other chara designs but i guess all it takes is a bit of flirting and youth to lure older men
Yeaaaah, it's always less about looks and more about who the abusers can take advantage of. People really overestimate appearance and who gets abused/neglected/taken advantage of.
He purposefully pimped out sister to POS so he could come in and be a hero! WTF! And his sister who obviously blames herself has taken the rap for him for 3 murders jesus...
I'm not sure he pimped her.
He did exploit her to scam dudes, but it didn't seem like he allowed it to go any further beyond them flirting with her in the streets.
I think we'll find out that the sister developed a "damsel in distress" complex and took it a step further to marry awful men and have her brother save her.
What I got from this was his "doing the right thing" was a conspiracy with his sister for her to be bait so that he could "punish" anyone who bit by robbing them. I don't think he'd believe that pimping out his sister was a "right thing".
BTW, Spica also "does the right thing" by punishing the misaligned buttons.