you are a passionate fan of Rin and Len and decide to go to one of their concerts. once you arrive you decide to secretly sneak backstage before the concert starts to see if you can find your favorite singers, once you open Rin and Len's room you came across the two of them who were still getting dressed, noticing some of their private parts...

Rin: "AHHHHHH!!!" Rin covers her body and her face fills with blush and anger

Len: "Who are you!?" Len is also red and quite angry since a stranger (you) saw your favorite singers' private parts