Yeah, I've read up to the latest novel, here's the weird thing though, new world years are longer than earth years, so technically Touya should be 17 at this point. I think sushie acts her age because her parents are actually chill like that, what with her not needing to be raised as the heir to the throne of Belfast and stuff. The novels are actually a pretty fun read if you have the time. I checked the wiki and final wife was actually 13 at debut. Tbh it's not like Touya does anything crazy with the 9 of them until he's actually married, the most they do is really just hugs and kisses and stuff, (he's constantly drained after marriage, bro canonically uses refresh and healing spells so they can go at it all night long