The one word that I have to describe "Kimi ga Ireba" (As Long As You're Here) and its accompanying music video by singer-songwriter Katsuyuki Mito（ミトカツユキ）is SNAZZY. Sounding like an even more soulful Noriyuki Makihara（槇原敬之）, Mito incorporates some ballet-like jazz piano tinkling along with funky arrangements to make this November 2007 single a happy-go-lucky winner in my books.
All that music goodness in one song is perhaps no surprise after reading his bio on J-Wiki in which Mito, who had started on piano when he was around 4 years old in his native Hokkaido, got the performing bug after hearing Earth Wind & Fire's legendary "September" on the radio one day. While doing gigs in Sapporo, he worked on a variety of jazz, soul and gospel pieces. When he came south to Tokyo in 2004, he did some busking along with work as a radio personality and even helping in the making of some drama theme songs.
"Kimi ga Ireba" was Mito's 5th single out of six that he has released so far, and he's released a slew of albums up to 2015, the majority of them being mini-albums.