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The episode starts with all of Lala's inventions scattered across a table. Lala is called to help Tearju Lunatique with the copier. Rito and Haruna accidentally change bodies when they catch one of Lala's inventions falling off the table. Momo explains that they have to use each other's bodies for seven hours. After school, Rito in Haruna's body gets splattered with mayonnaise when Haruna in Rito's body steps on a bottle of mayonnaise. The real Haruna has to then give her body a shower. However, the timer countdown finishes during this time, leaving Rito touching Haruna. Celine finds one of Lala's inventions, but because it seems to be broken, Momo lets her play with it. However, it fires a dart that lets Celine massage Tearju Lunatique, causing problems for her as it makes her feel as if someone is playing with her body. When Rito sees Tearju limping, he thinks she might be ill, so offers to take her to the sickroom. Celine uses the machine to violently caress her on the way, making her fall on top of Rito. Yami sees them and thinks that Rito is being "ecchi" to Tearju, so tries to kill him. The device is later revealed to be an invention to massage yourself. Lala gives it to Honekawa because he has terrible back pain.