If I look upon my sister's endearing face, I'll die... Quite by accident, Youta and Hikaru have finally returned to their original bodies. It should be a happy event, but just because they've reverted back to normal doesn't mean their brother-sister relationship can so easily return to the way it once was. Hikaru is adamant not to lose the momentum she's gained over the past few weeks, but Youta is torn about seeing Hikaru as anything other than his little sister. Now that she's back in her own body and not his, though, it's impossible for him not to notice how attractive the whole Hikaru really is...
At this point, I think I've either fallen prey to the sunk-cost fallacy or think this series is a particularly gruesome traffic accident I can't look away from. The base premise of body-swapping not-really-siblings in love with each other is a little squicky, but I'm willing to overlook a lot for a good story. When sexual assault is thrown in to be played off for laughs, this no longer constitutes such a thing. (The line about "it's not really rape if you're in a relationship" is especially troubling.)