I love this, only thing that would have made it perfect would have been if they were both older. Meiko looked mid to late 20s and of course the Risa is in high school still (though that could be as old as 18, they never said what year she was). Maybe Meiko in her late 30s and her husband left with the kids, and Risa running from home because her parents won't let her go to college over wanting to marry her off, that kind of thing.
Need more 'adult life' yuri in general