Presently listening to My Name (Wearing Me Out) by Shinedown. Truly a 'happy' song if there ever was one, but hey, it fits my mood.
♪ My name is worthless like you told me I once was... My name is empty 'cause you drained away the love... My name is searching since you stole my only soul... My name is hatred and the reasons we both know... ♫
I must admit that Kubo chose very interesting theme songs for Kazui and Ichika. Both are, I believe, pieces of modern jazz music, Kazui's being optimistic and upbeat and Ichika's being as energetic as she is.