Futatsu no Spica is great on being something. There are many intertwined connections between characters, extensive backstories and great character moments. But the biggest thing, that is missing, is the conclusion. Futatsu no Spica covers the first 25 chapters of the manga in 20 episodes. This is roughly 28% of the material, and, thusly, leave many unanswered questions in the end. Not to mention that, especially in the later episodes, some key parts are changed to fit into the anime format. All these changes are mainly made because the anime finished when only 30 chapters were released. But this wasn't the only issue. As being a dramaseries, Futatsu no Spica indulges itself in its slow pace. But don't misunderstand slow for being bad. It takes careful time to develop its moments and releases the emotional tension of the characters and the audience at the right moment, especially in the earlier episodes. The later episodes felt more rushed in some places as the material got scarce. And some of the episodes don't even have a emotional payoff even tho those heavily relied on them.

For characters, the main cast is well developed and are partly loosely connected by the main incident of the plot, a rocket crash in an urban area. But the good characters, sadly, end here as most of the secondary characters seem to be almost single-minded. Probably the biggest offender of this is Sano-sensei, one of the casts teachers. He has a big grudge towards the main characters for being the daughter of one of his ex-colleagues. While he gets an epiphany and redemption at the end of his arc, he simply vanishes from the plot, never to be seen again in the anime.

All in all, Futatsu no Spica was made to early. If the studio has waited more to let the manga finish, or at least progress more, it probably would be one of the best drama series. But for now all its flaws can be traced back to the fact, that the anime was made when the manga was early in its chapters. It is still great, but the end feels very lackluster in comparison to the rest.