A quick walkthrough, my memory is a bit fuzzy so some might be wrong.
(at every location, assume talk to everyone as part of the action)
After start, go south to talk to the lady with crystal ball.
Go north to see the kraken, you might need to lose to it once, then have sex with the guy who rescued you earlier, you'll get Fire spell, use that to kill kraken.
Go to castle, then the cave at the north to rescue some fighter girl.
Now head south to the water town, sleep at the inn and it should be night, the north east corner of the town should open up, go down kill, boss, move on.
Head SE to the dried up flower town, afterward go to the west forest, find a spot where there's no tree to enter the lost forest.
In the forest, follow the path with the tree stump, and take the other path if the stump have moss on it (i.e. it's green)
After that go back to flower town, then head north east to the magic school.
Come back to flower town to talk to a guy and he'll give you school uniform, equip that to enter the school.
After checking the school, go north west to the tower, rescue the little girl up top, then come back to school to face the boss pretending to be principal.
Go NE to the port town, get event where you turned naked to enter the house (but afterward you can equip armor again), kill boss in there and talk to the guy who made you strip and you'll get a ship outside the town.
Go NW to the snow area, talk to the guy in the middle of town to trade the doll for one of the 5 dragon pieces.
Go NE to the dragon island, you have to be naked the whole time in that town.
Go down the stair in the NW part of the town, follow it to a cave and loot everything there, one of them is another dragon piece.
Go to pyramid, you should get the tentacle scene now, go back to magic school and read the new shiny book in the library, then go back to port town, talk to a guy on the port and he'll give you an item.
Go back to pyramid, explore the area, 2nd floor you'll get one of the dragon item and magic key (I think, could remember wrong) 3rd floor you can get a scene if you wear bikini armor (and come back again to get a small coin)
With magic key, go to the castle you respawn when you get raped, and that room to the left have another dragon piece.
Now go clear the tower on an island and get the 5th.
Go to a small 3x3 island with temple in the middle, put all dragon pieces on the altar, then follow the path to beat the boss.
After that it's onto true end path ' 3' and I got too lazy to give a damn.