Mahjong Vanilla Syndrome (Japan)

[infacc00]

I would like to know what is the argument of the game. I mean, when you defeat a 'rabbit' you choose a key, open a door and ... a nude girl appears. Is there any difference between them (apart from the girl)?

I have looked at some and I have seen that:
- second key of first row goes to a girl that seems to give you a red ball

- third? key of second row gives? a blue ball

I haven`t found any ball in third row.

There are some spaces where there is no key, has it any meaning?

Thanks for your help.


Oh, I wish I knew japanese...