Drama-wise, Tatsu, Suzu, and Susumu should be the same age. The problem is, only Suzu looks 15, Tetsu is a perfectly believable 12-year old, Susumu, a hot 20.
After seeing the screenshot of ep 20 at the official site and leafing through vol 4 of the Shinsengumi manga, can't wait to see the episode. Righteous rage is a mighty fine thing to behold
BTW, can anyone tell me what the long talk between Kondou-san and an official-looking guy at the beginning of vol 4 was all about?