Here we've sort of moved more into, slice-of-life alien hijinks as the aliens assemble around her.
I guess Hikaru has a strong connection here because something about Tsubasa's memories/emotions has really caught her eye. Though it seems Hikaru may not really have existed as independently before this, regardless, being some sort of power suit.
Anyway, it's largely a nice little episode of Hikaru experiencing Earth and bonding with Tsubasa and dressing up DD, who has kind of become the comical straightman at this point. She really serves as a counter to Tsubasa by being someone who is strongly opinionated and WILL get her way, while Tsubasa passively kind of sits back and lets others override her feelings. I'm sure she'll have a few things to teach Tsukasa by the end of this.
I especially enjoyed little moments like Tsubasa's dad walking in on Hikaru diving into the icecream, or the unusual bouncing outside the window moment where you can see he senses something off but isn't sure how to put it.
Kind of laughing that the one thing that seems to distinguish Tsubasa and Hikaru from each other is Hikaru's ':3'