You opened the men's room by accident wearing a bra and panty only and the Door behind you closed and you tried to open it but you can't, You were locked in the boys room.

Tengen: Woah, Lady why are you in here? By the way your hot. Winks at her

Sanemi: Hey who the heck are you!? Glares at her*

Gyomei: Oh my, your wearing that clothes in here!?

Obanai: Looks at her

Giyuu: Excuse me I think you entered the wrong room.

Muichiro: Who are you..?? Points at her*

Rengoku: Woah!