I love how this whole manga is about status, being the the oppressor by day and the oppressed by night. You feel bad for a character because they're being oppressed then there status changes and they are now the oppressor. To me it's clear as day why kanae's friends are being so nice to her , they believe she's going to be in a relationship with hiroshi and hiroshi has a lot of status. Kanae being with hiroshi would raise her status , and being the friend of kanae would raise there status as well. They're most likely expecting some of those benefits to trickle down towards them as well.