Karin and the gang go to the beach. Kirio and Kirika happen to be there as well. Everything is well until Kirio tries to get Karin's ring, but takes Karin's swimsuit top by mistake. Now Karin and Kazune have to enter a contest against Jin, Kirio and Kirika, and win third place, or Karin won't have a swim suit. They get first place...but Karin also realizes her feelings for Kazune.