Forced Indecency Sisters.

Mai Kuraishi was attacked by two young men on the banks of the Chikuma River. They see her face and try to strangle her to death, but she is saved by Ota, who was just passing by in his car, and takes her home. When Mai's helpers jump out at Mai's strange behavior, she takes her in their arms. When Ota is surprised at how big Mai's house is, the people come out and thank her and ask her name, so Ota gives her his business card.