Exchange TicketI received an invitation to a Christmas get-together from Yuuka-san. ♪Drop in if you like. ♥Oh, wow!Merry Christmas, Yuuka-san.Welcome, gatekeeper-san! I see you've properly brought your exchange ticket!ChristmasTake a good close look at that exchange ticket!...Pa! Panty exchange ticket!PantyWe'll do a present exchange. ♥