So whats the deal with rika's home? are her parents doctors and just don't have time for her? Is the mother dead? the dad? It feels like there's some short of backstory or actual narrative buried somewhere in there, but at the same time this manga is such a shit show, it's hard to believe there's anything more to it than "haha funny boy tits".
Also when do the H stories take place? they seem pretty much canon, am I just supposed to accept that in between their showboob adventures this children are going at it like rabbits?