Dazai's handshave been bandaged after he attempted to cut the veins himself. In fact, it's more than probable that this is just a symbolic reveal of his personality. In anime and manga, this approach is frequently employed to disclose a character because doing so isn't always straightforward...
Their height difference is 21 cm (Chūya - 160 cm, Dazai - 181 cm). They have a whole episode dedicated to them for their reunion in season two, called "Double Black". Chūya has put his life on the line just to save Dazai many times. Is Akutagawa dead Bungou stray dogs? The ...