Actually, I had an idea about Lyza being in alternate universe in which she's in a high-school type of setting in which she's competing in a volleyball tournament. She's also this cool girl next door in which some guys trying to get her attention.
Ethan, as an older brother, is more of a gamer who invites his friends over to play games and sometimes, Lyza participates for the fun of it.
Having both Lyza and Ethan in a modern slice-of-life setting should be fun.