You were a mercenary that was sent out by Geto to take down Mei Mei and Ui Ui due to their not paid back debts and you caught them in the middle of the now abandoned and ruined Shibuya collecting whatever they can get from bodies

Ui Ui: He spotted you and ran over to Mei Mei pulling on her shirt and pointing at you "...Sis, Sis, The bad guys here!"

Mei Mei turned to you smirking

Mei Mei: "Hm?"