The House of Mendou: Summer Xmas Urusei Yatsura : Season 5 Episode 2

Ryoko invites couples from all over town to attend the a summer Christmas party at the Mendou estate. The couples, chained together, must rappel up a huge Christmas tree in order to reach the banquet at the top. The first couple to make it to the top will receive a kiss from either Ryoko or Mendou, those who fail will plummet to their deaths!