Nope, they are not lesbians. This girl here is Teru's best friend. She was arguing with Teru over the fact that Kurosaki shows romantic interest tiwards Teru. And was measuring the distance between them when the (almost) kissed. And this is how sick this manga can get. Ok? They didn't even kissed, get real. That's why I tell you this is too sick for some concious people. And by the way, Teru and Kurosaki are neighbours as well.