This is my first submission~
I couldn't find a good version of Boku wa Kuma, until I fond this one :')
No credit to me, I found this one someone else did through a Japanese guitar tab site. 
(http://music.j-total.net/data/003u/003_utada_hikaru/020.html)
Thought I would post it here as well, so non-Japanese speakers can enjoy it as well.
Enjoy!~
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Capo - 3rd Fret

C                 Am       G
Boku wa kuma kuma kuma kuma
Dm             G     Dm   G7  C
Kuruma janai yo kuma kuma kuma
F        Em      F
Arukenai kedo odoreru yo
Dm      Em         F
Shaberenai kedo utaeru yo
C                 F     G7   C
Boku wa kuma kuma kuma kuma


C                 Am       G
Boku wa kuma kuma kuma kuma
Dm             G     Dm    G7  C
Kenka wa yada yo kuma kuma kuma
F       Em       F
Raibaru wa ebi furai da yo
Dm      Em         F
Zense wa kitto chokkoreeto
C                 F     G7   C
Boku wa kuma kuma kuma kuma


Bonjour!  Je m'appelle Kuma.
Comment ça va?


C                 Am       G
Boku wa kuma kuma kuma kuma
Dm             G     Dm      G7   C
Fuyu wa nemui yo  kuma kuma kuma
F       Em         F
Yoru wa "Oyasumi, Makura-san"
Dm     Em         F
Asa wa "Ohayou, Makura-san"
C                 F     G7   C
Boku wa kuma kuma kuma kuma


F        Em        F
Yoru wa "Oyasumi, Makura-san"
Dm      Em       F
Asa wa "Ohayou, Makura-san"
C               F     G
Boku wa kuma kuku kuma
   F    G7    C
Mama kuma kuma