I must be drunk..
I meant to ask how to increase the blue and pink bars for each person
Blue bar is like a "study" action, you increase it by doing the three "work" (pencil) actions. Dish washing (Miyuki,mom) you just left-click to move the indicator up and down, higher on the bar takes more off the dishes dirtiness value, you want to bring it to exactly zero (so use the lower part of the bar near the end of the dish). If you bring it below zero the dish breaks.
Indoor studying (Yui, blue/purple-haired younger sister) is just doing elementary school arithmetic. Move the bar up and down (left click) to high light the correct answer, middle-click to select. You can also right click to stop the bar from moving but I find this seriously slows things down. Instead, for the middle answer I will move the bar up higher (so that the top answer is barely selected) then let it drift down to the correct answer. I can get perfect results every time this way.
Outdoor studying (Rei, blonde older sister) involves documenting your outdoor activities: fishing and bug catching. Activating it checks your activities since the last session, so you need to have done at least one of one of them each time your want to activate the option. (Note, it doesn't use the items you catch up, so you can still turn them in to the researcher for credit.)
The more/better you do at each of these the more points you get.
The pink bar is affection. You increase these by doing various personal actions with the girls. Performing their study actions gives you 3 point (and you can continue to do this even if the blue bar is maxed out). Giving them (generic) gifts give you 2pts (even the cheap 60 yen one, don't bother with more expensive). Spending the night with them gets you 5pts. There are others as well, but these are the 3 main ones.
Edit: And I forgot, there are present boxes you can gift the girls to increase both of these as well. You can get them for free at action points of the ground sometimes, or from fishing (beach fishing seems to give you these more often), or you can buy them from the guy in the gym storage room at night.
Anyone know how to cheat money using Cheat engine?
I've never had any luck with cheat engine on games that using this game engine.
I just use a save editor like this one:
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