Wow, it's really odd to see how quickly opinions change here. So far it also seemed Masaa is a good person to me, but considering this manga is all about superstitious appearance and the truth behind it I'd advise to be careful with any judgements. We see a lot of not nice behavior (cheating, gluttony & porn), but Amano uses this to then turn you around by showing you what is behind it. Which makes it a really good work imo.
Btw, calling Asuna a nymphomaniac might be a little drastic (especially if you also want to imply promiscuity, i.e. "maximizing the number of partners"). Perhaps she has a higher sex drive than some (definitely higher than Fue), but whether it's manic or not is hard to tell so far. Take a look at http://dynasty-scans.com/chapters/the_feelings_we_all_must_endure_ch02#16 for example. Asuna tries, very politely, careful to instigate something and Fue immediately brushes her off. Asuna directly retreats. I think she does love Fue, but she's inexperienced with a real relationship (keep in mind all the girls more or less just entered adult life). She tries to do all for her beloved and not to bother her at all to the point of neglecting her own needs. Just like modern romance tales teach you to. Finally she kind of can't take it anymore and cheats. That doesn't make the act of cheating any better and it doesn't mean she "cheats because she loves Fue so much" (which does indeed sound like a bad porn script). No, she ultimately cheats because she strained herself too much. Stupid tactic. She was too afraid of confronting her girlfriend with her own needs. Sure, there might have been no solution at all (if Fue can't compromise, i.e. if they can't find a level of sex they are both comfortable with), but then they could have split up with a less messy cut.
I think this manga is all about that stuff. Things are not as black and white as they seem. People doing ugly things can actually be pitiful and easy to sympathize with, nobody is just an asshole out of pure spite.
Nice analysis. I hate how many people on this thread reduce Asuna to some disgusting cheater. I mean, I also hate cheaters and cheating on someone who loves you is definitely unforgivable to me, but like you said, this manga shows that things are not just black and white. Chapter 6 made it obvious she did care about Fueko and loved her, but she badly handled their issues. She should have confronted her girlfriend (or I don't know, have some fun with herself instead of cheating ? jk obviously, I'm conscious this is really different from actually having sex with someone haha).
Sachi is my favourite though and I don't care if people don't like her because "she got it easy"... Like what ? Being in an abusive relationship definitely is the opposite of getting it easy. Because, yes, the way her boyfriend used to treat her are signs that he was emotionally abusive to her. I've been in such a relationship and trust me, it can destroy you. Sacchan is actually really strong !
Anyway, this manga is just getting better and better. I used to hate Meru since she seemed like such an hypocrite to me, but chapter 7 made me feel sorry for her and I get where she's coming from. Girl sleeps around cause she needs love, and that's sad. I like how the focus is on each girl now instead of the main couple (while I do find Ruki and Sacchan adorable and ship them) ! I'm waiting for a chapter about Maasa or Fueko.
