For NTRPG2 or Skybride? Can't help with the latter (my system doesn't even render the characters properly), but for the former:
First I'll make a note here - you need money at a few points in the game. To make money, you can run around and gather mushrooms (they have sparkles on them), kill monsters in the cave beneath the southern bridge, chop down trees (makes time pass), sniff Marie or Filia's panties hanging between your houses (makes time pass), bathe under the waterfall (makes time pass) or practice with your sword after you've got 3 stars (makes time pass, and doesn't make much money). Note almost nothing gives you money directly, but rather gives you items you can sell for money later. You will need a grand total of 2300 gold to clear the game.
For the prologue, just follow the directions from the note outside your room. What I'd recommend is the following:
Mon: Morning go to the elder's house (to the northeast) and talk to Filia in the attic. Afternoon go just south of the elder's house and talk to Garudo (he's hiding in the trees). Evening go to the tavern (to the west) and talk to Filia. Night go to the graveyard (northwest) and talk to Filia.
Tue: Morning practice your swordsmanship in front of your house. Afternoon go to Garudo in the same place as before and talk to him. Evening practice swordsmanship. Night go to the Ancient's Grave (giant gravestone across from the bridge near the mayor's house) and Filia will teach you how to read it.
Wed: Morning practice swordsmanship for the last time. Afternoon go to Garudo again. Evening go under the bridge to the south of town, kill everything, and loot the chest. Night go to the lumberyard (south of the graveyard and shop) and cut down one of the three trees that are marked and in a line.
Thur: Morning talk to Marie in front of your house. Afternoon and Evening cut down the remaining two trees. Night take the treasure revealed by this, then go cut down one of the other trees (you'll be selling the log later).
Fri: Morning talk to Filia in front of your house. You've got nothing to do until night, so make some money. At night, talk to Garudo Horny Panty Man in front of your house, then go to the cave under the bridge to save Filia from the monster.
Sat: Morning talk to Filia in front of your house. Afternoon, go to the general shop (west) and talk to the owner to see the red orb appraised. Evening and Night, make money.
Sun: Just spend the day making money.
Mon: Morning go to the store, sell everything you've collected, and buy the red orb. Spend the day making money.
Tue: Morning go back to where Garudo built his trail, and take it to spy on Filia bathing. Knock him into the water, and Filia will punch him through (!) the waterfall. Noon go into the cave she opened up and loot the chest.
You now have all the orbs and can place them on their appropriate pedestals at the Ancient's Grave. From left to right, place them red, blue, green, purple. Once you place the last one, you'll be dropped into an inescapable cave, so if you want to continue running around before everything goes to Hell, this is your only chance (not that there's anything to do). Once you fall in, exit the room you're in by taking the exit north of the kid on the throne. Simply follow the path until you reach an invincible demon, then go north to watch Mars get his ass kicked and Ragnas save the day. Mars wakes up in the elder's house, go upstairs to listen in on Ragnas fucking Filia. The next morning, go to the elder's house to listen to Ragnas' explanation, then go upstairs and pick up his supplies on the chair to end the prologue.
Phase I is pretty simple - there are 4 scenes to get. Go to the tavern at noon and talk to Ragnas, and he'll leave for the previously-sealed cave. The next day, go to his room at night to listen to him fuck Filia. Repeat this for scene 2. For scene 3, go to the chief's house at night on Saturday. Let a week pass, then go to the chief's house on Saturday Evening for the last scene to end the phase.
Phase II is even simpler. Talk to everyone to advance to the next time point. In the bathhouse, go to the eastern wall to listen in on the other side the first day, then after that each time you go to the bathhouse enter through the back gate and listen at the door. At night, go into Ragnas' room to end the day (and watch him fuck Filia while Mars sleeps on the floor). Just go through it all until the phase ends.
For Phase III, there are a huge number of optional scenes, with the details of how to get them spelled out on the noteboard outside of your room. If you can't figure them out, don't worry - you can watch all the scenes from the gallery room at the end, even the ones you don't get. The objective of Phase III is to basically keep finding evidence that Marie is getting fucked, although Mars somehow remains oblivious. Each such "checkpoint" gives you an emblem (and removes a piece of Marie's clothing in the little vision it shows). At some point before Friday, you'll want to go to the general store and buy cheese and medicine.
Mon: Go to the tavern at night and try to use the stairs to see Marie go into Abel's room.
Tue: Same as Monday, but this time you see her leave Abel's room in a bunny suit and go to Ragnas' office.
Wed: Go to the waterfall bridge in the morning. You'll see Abel and Marie come from behind some trees (where the ground is covered in cum).
Thur: Go to Filia's house in the morning (if you don't wake up there from one of the optional scenes), then go to your house and go to Marie's room. interact with her cum-covered lingerie for the next checkpoint.
Fri: Talk to Marie at noon and choose to take care of her. Evening, talk to her again, and use the cheese to make some mediocre pizza. Night, talk to her one more time, and give her the special medicine.
If you don't have all the checkpoints come Saturday, you end up in some weird Hell dimension. Practice with your sword, and everything will reset to Monday, then go get the checkpoint(s) you missed.
Once you reach Saturday with all checkpoints in play, go to the tavern. Murder (!) the guy guarding the stairs, then try to go to Abel's room. You'll get thrown out, so go to Ragnas' office instead. Go back to Abel's room, then back to Ragnas' office, then finally go home... and get stabbed to death. Congratulations!
You'll be back in the weird library with the kid. You can go back to any Phase to replay it by interacting with one of the books (going back to Prologue ends the game), or go to the back room to loot the only remaining treasure chest for a gold bar worth 99,000 gold. Interacting with the piano will take you to the gallery room. Go back to Phase I or III to sell the gold bar (from those phases, you can go back to the library by entering the cave).
Provided you now have 100,000 gold or more, use the first book to go back to Phase 0 and get the Super Happy End. Note if you have insufficient funds the ending is basically exactly the same, but without the Epilogue blurb about Mars taking Filia and Marie and GTFO'ing.
