Tried the game out and well it suffers quite a bit from not being very informative on what your suppossed to do like there is a video guide for the game but all it explains is that if you don't cook food for your family then your kids affection will drop and once it drops too low you get a game over also you need to do a sexual release every 2 days or you skip a day cause you were too horny.
From what I could gather the game once it hit sandbox is pretty much the following.
You can raise fitness, charisma and knowledge in the bedroom, Megumi will tell you that you need X stats for the other girls but there is no info or indication on this so no idea what they might be. Fitness for now just seems to up salary gain by 1 $ and Knowledge unlocks more recepies. I just raised them to all to 50 through a save editor.
You eventually get told by Megumi that she will teach you how to get girls and after this you pretty much just have to chat with her 19 times, each time gives +1 affection, you need to reach 19 affection to advance to the next then it continues with 39 - 59 - 79 - 99 to reach stage 1-6 with the girls. By getting Megumi to stage 2 you unlock gift giving, option to get +2 aff instead of +1, stage 3 dating, option to get +1 or +3 aff, stage 4 unlocks condoms, stage 5 nothing new far as I could tell.
You pretty much need to progress Megumi to unlock anything new and once you reach stage 5 the main story goes into stage 6. At this point I all of a sudden could unlock more girls, namely Suzuna and Yuki.
Suzuna just unlocks by going to school it would seem but Yuki seemingly requires you to go to the shop on a sunday between morning and midday. Then after that you unlock the same 19 - 39 - 59 - 79 - 99 progression. Suzuna requires you to go to the cafeteria at 19 during midday to unlock her next stage and then at 39 go to the school entrance at the evening.
Yuki is a bit trickier in that she requires you to mostly meet her on sundays in either the downtown district or market street. Eventually you can unlock her to 100 aff and then you can go to he massage parlour at night to have raw sex, this in turn fills the crystal ball by 5% each time.
But for now at least I have no idea what the crystal ball does, nor do I know how to raise the son + daughter aff above 19 and I have no idea how to unlock the 4 other achievements outside of rubber my saviour that seems to require you to keep the condom and then it unlocks by following Megumi's aff unlocks which will result in sex with Yuki when she is introduced.
But at the moment the game has a bunch of areas but almost none of them matter and I could only find raising affection with the 5 characters mentioned here but only Megumi + Yuki have any content outside of building affection.
Is futa on male optional?
So far from what I could find there is no futa x male option in the game outside of after the futa finding out that her husband cheated she can confront him about it which leads to a game over or a one time scene after this where she is mad and you get another option to fuck the husband. Outside of those two scenes everything is futa x female at the moment, but there isn't a lot in the game yet so far there is Megumi BJ scene and sex scene, then Yuki BJ + sex scene with condom and one raw.