This is my first tab, I was picking it by ear and I wasn't following a certain rhythmical measure. It's basically going with the flow and tone of the original song, so if you know how it sounds you'll have no problem picking the rhythm up. Hope you will all enjoy it! 

Happy Rainy Day

K-On   
     

     E  E  E  E  E.  S   E      E   E   E.  S    E  

E||--16----16----16------16--|--16------16-------16--L--|
B||-----16----16-----16------|------16----- 16----------|
G||--------------------------|--------------------------|    Repeat 2x
D||--------------------------|--------------------------|
A||--------------------------|--------------------------|
E||--------------------------|--------------------------|


  E  E   E  S  E  S  E  E       E  E   E  S  E   S  E  E    
--16-----16-------16---------|--16-----16--------16--------|
-----16-----16-------16------|-----16-----16--------16-----|
---------------17--------17--|---------------17--------17--|
-----------------------------|-----------------------------|
-----------------------------|-----------------------------|
-----------------------------|-----------------------------|


  E  E   E  S  E  S  E  E       E  E   E  S  E   S  E  E    
--18-----18-------18---------|--18-----18--------18--------|
-----18-----18-------18------|-----18-----18--------18-----|
---------------19--------19--|---------------19--------19--|
-----------------------------|-----------------------------|
-----------------------------|-----------------------------|
-----------------------------|-----------------------------|

  E  E   E  S  E  S  E  E       E  E   E  S  E   S  E  E    
--16-----16-------16---------|--16-----16--------16--------|
-----15-----15-------15------|-----15-----15--------15-----|
---------------16--------16--|---------------16--------16--|
-----------------------------|-----------------------------|
-----------------------------|-----------------------------|
-----------------------------|-----------------------------|

                                                
  E    Q  E. S   Q  E.S  Q     S   E.   S   E.  S.       Q  E. S  Q  E. S  Q   
||-------9---------7-------9--|------10---9---7---------|--7--------9-------------|
||----------------------------|------------------10-----|--0--------0--------7----|
||-------9---------9-------9--|-------------------------|--8--------7--------8----|
||----------------------------|-------------------------|-------------------------|
||--0--------0--0-----0-0-----|--0----------------------|------9-9------9-9-------|
||----------------------------|-------------------------|-------------------------|


  E    Q  E. S   Q  E.S  Q     E.  S   E.  S.   H     E. S   W  (Let ring)
-------7---------9-------7--|--9---7-------------------|-----------------------|
-------6---------6-------6--|----------10--9----10--L--|-----5-----------------|
-------7---------7-------7--|--------------------9--L--|-----6-----------------|  2 x
----------------------------|--------------------------|-----------------------|
----------------------------|--------------------0--L--|-0---------------------|
--0-------0-0------0-0------|--------------------------|-----------------------|



  S  S  E.  S   H           S  Q   Q   S  H   S  H    S   H     H     
-----5--5-------5--L-----|-----5---7------9---------|------9----10------9--6-|
-----6--6-------6--L-----|-----6---6------------10--|------------------------|
-----7--7-------7--L-----|-----7---7------9------9--|------9-----9------8--7-|
--0---------0------------|--0----------7------7-----|-7-------------7--------|
-------------------------|--------------------------|------------------------|
-------------------------|--------------------------|------------------------|


  S  S  E.  S   H           S  Q   Q   S  H   S  H    S    Q     Q   S   Q  Q
-----5--5-------5--L-----|-----5---7------9---------|------9-----10------9--6--|
-----6--6-------6--L-----|-----6---6------------10--|-----------------------0--|
-----7--7-------7--L-----|-----7---7------9------9--|------9-------------8--7--|
--0---------0------------|--0----------7------7-----|-7--------------7---------|
-------------------------|--------------------------|--------------------------|
-------------------------|--------------------------|--------------------------|

 S   Q  Q  S  H    S  W       Q   Q    Q     Q        Q.   S     H (let ring) 
-----6--9-----6-------5----|----------10-----------|--------------------|
--------------0-------4- --|------7----------7-----|--7----9-----9------|
-----7--------7----4--4----|-----------------------|--------------------|
-7---------7---------------|--9--------------------|--------------------|
---------------------------|-----------------------|--------------------|
---------------------------|-----------------------|--------------------|


  S  E   S  E    Q   Q     S   E  S  E   Q   Q        H             H
||-----5------3-----------|------------------------|----------------------|
||-----------------6---5--|------8-----6---5-------|----5-------------1---|
||-----5------5-----------|------7-----7-------7---|----5-----------------|   2 x 
||--3------3--------------|------------------------|----5-------------3---|
||------------------------|--5------5--------------|----------------------|
||------------------------|------------------------|----------------------|


   E     H      H    H.     E     H     H    H.     Q     W (Let ring)
-------------------------|-----------------------|--------5---------------|
--10-----10-----7----L---|--10----10----7----L---|--10----5---------------|
-------------------------|-----------------------|--------6---------------|
---9-----9------9----L---|---9-----8----8----L---|--8-----7---------------|
-------------------------|-----------------------|--------7---------------|
-------------------------|-----------------------|--------5---------------|


  

Duration Legend
---------------
W - whole
H - half
Q - quarter
E - 8th
S - 16th
T - 32nd
X - 64th
. - note dotted
|-n-|  - n-tuplets


Tablature Legend
----------------
L - tied note
x - dead note
g - grace note
(n) - ghost note
> - accentuded note
NH - natural harmonic
AH - artificial harmonic
TH - tapped harmonic
SH - semi harmonic
PH - pitch harmonic
h - hammer on
p - pull off
b - bend
br - bendRelease
pb - preBend
pbr - preBendRelease
brb - bendReleaseBend
\n/ - tremolo bar dip
\n - tremolo bar dive
-/n - tremolo bar Release up
/n\ - tremolo bar inverted dip
/n - tremolo bar return
-\n - tremolo bar Release down
S - shift slide
s - legato slide
/ -  slide into from below or out of upwards
\ -  slide into from above or out of downwards
~ - vibrato
W - wide vibrato
tr - trill
TP - tremolo picking
T - tapping
S - slap
P - pop
< - fade in
^ - brush up
v - brush down