Writer and Artist: Kou Yaginuma
As noted in my first post about the series, Twin Spica is classified as seinen, meaning the target audience is men, ages 17-40. This is a little surprising - at least from a Western perspective - considering the highly sentimental aspects of the story. American movies targeting men, by contrast, are generally not renowned for emotional depth. Thinking back in my own experiences in Japan, the men I knew were, indeed, less shy about expressing certain emotions than their American counterparts. This is not to imply that the macho image isn't a significant part of the culture because it certainly is. It's just shaped a bit differently. Wistful longing for elements of the past - school chums, mom's cooking and, especially, those passed on - is part of what it is to be a man.
So, a teenage girl weeping over her long-dead mother? Chick-flick material in the States. Totally fair game for seinen manga.