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The 3g is for part 1 of the game and 900mb is for part 2 they are both different game if you want install them together its find they did this so they can avoid making the app to large for android I think? Well you already see it's all ready  so 3g its gonna be very hard for android user that has low storage. And yes its already has the incest patch you can pick if you want to disable it or not at the start of the game.

first you need to finish mikoshi quest after that visit her at the clothe store to get a cool new outfit

TIP. To activate mikoshi quest first go to the clothes store morning or noon

Hope the helps

Finish all existing quest except for the sectoral movement after that wait for a day then visit the pond in the forest again

Hope that helps