I'm trying out that japanese for ai too but its not easy...and I'm not sure what part is the starting point so I just started from the line before I heard hawaii...:-P still trying though... step by step.
Ai-chan has sung in two different concerts, if you want her in green and purple with the MC GAKI starter than you should look at teh 2007 winter H!P concert. If you remember just her performing it in yellow then you'd want to look at the sexy 8 beat concert, its 14th chapter according to the box ^^.
Hope that helps... its hard to resist her cutely drawing dainari equals and hearts in the air... adorable!!
EDIT:
Ok taking a break from listening, so let's do some Ai math
Ai + Singing
cute