Funny story - Daiichi was so nice of a person that his demise almost failed to move me at all. He was kind of bland character, I guess, probably due to having gotten only one episode for his own story, as opposed to Chizu's story which certainly touched me a lot more.
And in other news, so many weeks after I first heard the OP but I still can't get it out of my head, I actually find myself trying to sing the tune in public from time to time.