RBK-050 The white hat hacker Sumire Mizukawa who was abducted and imprisoned

A white hat hacker is someone who counters illegal intrusions into networks. Eri, a programmer entrusted with the security of corporate confidential information, is one of them. On the other hand, the black hat hacker Takagi attempts to hack into a certain company's network but fails every time. Realizing he can't match up technically, Takagi finds out that the security is handled by Eri and abducts her. He subjects her to sexual torture using aphrodisiac yams in an attempt to force her to reveal program passwords...