Suo and July find themselves in a dangerous situation thanks to a double-crossing supposed ally. Later, when the young pair is abducted by an especially sinister Contractor, BK-201 must spring into action.

Aboard a speeding train, Hei's team is ambushed by Russian authorities. In the ensuing battle, Suo and Tanya recall the times they shared in the past as friends - and clash violently in the present as Contractors.

Kiko and Kurasawa help Suo search for her mother. After a mysterious stranger points the young Contractor in the right direction, a long-awaited reunion leads to an unbelievable revelation.