I sort of see what people mean when they say that Moe's and Eiko's relationship is creepy and too much, but I really cannot agree with that.
The manga is very deep, it looks at many important aspects of life. Finding a great friend like that is hard and you will definitely cherish that friend very much. Since the characters are on two extremes of a spectrum it is generally not really possible to compare the manga to real life.
Also, from the background stories their close bond makes perfect sense and they are not at all too close and creepy, there is nothing lesbian going on. I mean I don't know how many times me and my best friends propose to each other or tell each other that it would be awesome if one of us could be a guy because then we would totally go out. It's a joke in a sense, but in another sense we mean it. We don't have romantic feelings but we really love each other and each others company, so I wouldn't mind spending the rest of my life with them! 😉
Some people say it doesn't make sense that Moe tells the guys who ask her out to also take care of Eiko, but it totally does. Imagine yourself in her shoes, being pretty to the point where practically every guy who sees you ask you out. How are you supposed to tell who actually cares about you, and who just likes your looks? Somebody who was willing to also be there for Eiko would be way more likely to be a good guy who actually cares about you. I wouldn't set this criteria myself, but if I was in Moe's situation I most probably would have.
Plus, she does point out that she would only settle for a guy who is just as sweet and caring as Eiko. I don't find that weird at all, I often compare my closest and bestest of friends to new people I meet, and I would not settle for a boyfriend who was less of a great person than they are. He doesn't have to be the same of course, but I would have to feel just as close to and like him just as much at least, otherwise it's a no no.
Lastly, it is not strange that Moe gets angry at Tsuchida and dumps him that time. He was in the wrong in making a move at her when she was being worried about Eiko. It might have been a bit farfetched from her side, but she still barely knew him, and that made his comments not acceptable. Had he cared enough about Moe he should have been able to see her feelings and known that that was not the right moment. However, he seemed like a really nice guy after all, and he did learn his lesson and seem to take to heart what Moe had said, so I think he sorta deserves a second chance. Especially since he was so down during the rest of the manga, that was probably one of the most painful things throughout the manga, because he never really seemed happy again. Also, I think they would probably make a good couple. Plus, he probably has a bigger chance now actually when his best friend is dating Moe's best friend, so I'll hold my fingers crossed! 😉
Of course Eiko's little brother is a pretty great guy too ^^
I wish it could have been a tinsy bit longer though, since I really would have loved to see Moe find someone as well! ^^