I made this tab based on this video version ( http://www.youtube.com/watch?v=J-Mq-WeCulE )... because if you can play this version, then you can play any other.
I suggest to you train this tab while listening to the music.
And if you can't find the music version with the link that I put, then search "Omoi Odorenai Warutsu gut guitar version" on youtube. 


5 6 -5 5 -4 4 -4 5
5 5 6 -5 5 -4 4 -4 -3
3 -3 4
5 5 -5 6 4
4 -4 4 -4 -3

6 -7 7 -8 8
9 -9 8 -8 7 -8 8
8 9 -9 8 -8 7 -8 -7
6 -7 7
8 8 -9 9 7
7 -8 7 -8 -7


2 3 2 -1 1 -1 2
2 3 2 -1 1 -1 (1,2)