tragic story of a lesbian with a mental illness that results in her ruining the lives of young girls because she is unable to resist her predatory urges.
I think it's her good fortune to have met Kousaka.
Imagine if she hadn't met her? She would have probably gone out with some guy once in High School, before settling down, getting married and popping a kid or two. End Of Story.
Here, she discovers the wonders of lesbian sex and she obviously enjoyed it, even if it confused her because of her lack of knowledge.