Tears Are Not Enough - S2.E4

Birdy tracks down the illegal Virtual Reactor Chips purchaser, who is Nataru's father, Mr. Dusk. Dusk reveals he is a member of an Alterian freedom group, and that he helped disguise the escapees. Birdy goes after the nearest, but the escapees kidnap Dusk and interrogate him on the attacks on their number. He is murdered, which angers Nataru and upsets Birdy. Nataru kills another of the escapees, but not before learning Valic killed his father. Birdy promises to catch Dusk's killer.