Yeah, that pink martian was a critical point in the series. Until then I was able to watch it not paying any attention to "kiddy" nature of animu. However, pink alien made it impossible to treat this anime seriously and I almost dropped it. But I didnt, and I am glad.
Its a childish anime. It was made for 12 yo girls. It has no epic battles or mindcrashing problems: first love, school break, everyday school life, runaway pet are the scopes of this anime. And its one of the best children anime out there.