OMG yes I totally & almost forgot that Shinpi talked about Kanashimi wa Kitto on his blog til you said so
(bad fan bad fan I know xD)
but yeah told you it's a good song Nat haha
UVERworld have other good songs in their discography like erm ... colours of the heart & Hakanaku mo Towa no Kanashi
In fact Hakanaku mo Towa no Kanashi is their 1st & still only single to debut at #1 cos of the tie in that they have with the Mobile Suit Gundam 00 Second Season anime