Just give Bell an allowance and in an interlude section make the Brothel available with a button that says continue story. Shouldn't be much more then a few 'if in VN mode' and a custom VN interlude scene. Could even make the one tied to the minigame just a if in VN then short work on farm and max points.It's not done on purpose, those scenarios are simply too tied to the game's elements and cannot exist on their own.
It's also the reason why I can't just make an Android build, but made a poll for it as it'd require me to rewrite a lot of things to put all the content into a Visual Novel only format.
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Then again someone that's good with unity could make a mod for it. Doesn't effect me much but you have options to get it working in VN mode AOE magic bombsMagic at some point can become your only way of attacking, since the MP quickly raises up to allow you to use only magic.