On Improvising:
im sugesting C penatonic. but i can be wrong =)

Intro
E|--------------------------------|
B|--------------------------------|
G|--------------------------------|
D|--------3--3--1--1--1--0--1--0--|
A|--3--3--------------------------|
E|--------------------------------|

E|--------------------------------|
B|--------------------------------|
G|--------------------------------|
D|--------3--3--1--0--------------|
A|--3--3--------------------------|
E|--------------------------------|

Fill *note: i have no idea how it goes but the 3 first note sounds right*
E|--------------------------------|
B|--------------------------------|
G|----5-8-5-3-5-3---3-------------|
D|----------------5---------------|
A|--------------------------------|
E|--------------------------------|
Main Riff

E|-----------------------------|
B|-----------------------------|
G|--5--3--5--5--3--5--8--3--5--|
D|-----------------------------|
A|-----------------------------|
E|-----------------------------|


E|-------------------------------------|
B|-------------------------------------|
G|--15--15--15--14--10--10--10/12--12--|
D|-------------------------------------|
A|--13--13--13--12--8---8---8/10---10--|
E|-------------------------------------|

E|-------------------------------------|
B|-------------------------------------|
G|--15-15-15-17-15-14-10-12------------|
D|-------------------------------------|
A|--13-13-13-15-13-12-8--10------------|
E|-------------------------------------|


Slow Part

*note: the fast parts is wrong but this is as close as i get*

Shamisen part

E|-----------------------------|
B|--------------------8-6------|
G|--8-8--8-7-8--5-7-8-----8----|
D|-----------------------------|
A|-----------------------------|
E|-----------------------------|


E|-----------------------------|
B|--------------------3-1------|
G|--3-3--3-2-3--0-2-3-----8----|
D|-----------------------------|
A|-----------------------------|
E|-----------------------------|


E|---------------------------------------|
B|----888888-88-11-8-88-11-8-6-8-6-4-6-4-|
G|---------------------------------------|
D|---------------------------------------|
A|---------------------------------------|
E|---------------------------------------|

Back to main riff with solo
i have not enough transcribing skills for the solos so improvise over the
notes that's in the song.

After the solo:


E|-------------------------------------|
B|-------------------------------------|
G|------------8-8---10-10--------------|
D|---10-10----8-8---10-10--------------|
A|---10-10----6-6---8--8---------------|
E|---8--8------------------------------|

Shamisen
E|-----------------------------|
B|-----------------------------|
G|-------5h8p5---5-5-----------|
D|----5h8------8---------------|
A|-----------------------------|
E|-----------------------------|

E|-------------------------------------|
B|-------------------------------------|
G|------------8-8----------------------|
D|---10-10----8-8----------------------|
A|---10-10----6-6----------------------|
E|---8--8------------------------------|

Guitar
E|-----------8---11b13r11p8------|
B|---------8---8------------11fb-|
G|---10b12-----------------------|
D|-------------------------------|
A|-------------------------------|
E|-------------------------------|

E|-------------------------------------|
B|-------------------------------------|
G|------------8-8---10-10--------------|
D|---10-10----8-8---10-10--------------|
A|---10-10----6-6---8--8---------------|
E|---8--8------------------------------|

Shamisen *Note: i think its playde like this but its not perfekt*
E|-----------------------------|
B|-----------------------------|
G|-------5h8p5---5-5-----------|
D|----5h8------8---------------|
A|-----------------------------|
E|-----------------------------|

E|-----------------------------|
B|-----------------------------|
G|-------5h8p5---5-5-----------|
D|----5h8------8---------------|
A|-----------------------------|
E|-----------------------------|

E|-----------------------------|
B|-----------------------------|
G|-------5h8p5---5-5-----------|
D|----5h8------8---------------|
A|-----------------------------|
E|-----------------------------|

And then back to the main riff like in the beginning. then some solos and then it ends