At Death Cram School, a letter arrives containing an invitation to a spa resort. Yumi announces to the four excited girls, "No. This is evil itself," and points out that they have been slacking off too much. Shiki proposes, "When opinions are divided, it's time for boob rock-paper-scissors!" and wins, so everyone heads to the pool. There, girls from Hanzoo Academy, Homura Crimson Squad, and Hebijo Clandestine Girls' Academy also show up, but Asuka says, "Let's have fun together today," and they agree to a temporary truce. However, a trivial matter leads to a bitter quarrel, and at Yumi's suggestion, they settle it with a showdown in the style of the ancient shinobi.