There is a walkthrough, but it is for 1.04 only.
After you beat the boss and Save Kyoka, you can battle her in a friendly match for the Starling accessory that teach an AOE light spell (causes a status that GREATLY reduces damage enemies can do). Friendly Kyoka cannot rape/molest you but does more damage with her attacks than her "final boss form".
After you defeat Yui in the arena enough times that spying on her repeats the same scene, you'll be able to enter the locked metal door in town where an NPC there will ask you to clear the basement of failed experment monsters. On the East side you'll find a crack in the "barrier" that Saki believes she can free Yui with. Defeat every monster in that room and Saki will say to go get Yui. Enter the arena but now you have a choice to convince her to run away with you. When you get to the crack, a very large battle with ensue. If you lose it, Yui will sacrafice herself to let you escape, giving you a scene with her and the monsters that has 3 versions (so this is repeatable); if you win Yui insists she's happy and goes back to her master allowing you to continue to repeat the event.
After Rescuing Yui once, a new dungeon appears behind Mikoto's house (center of first town). After fighting through 4 elemental themed areas with hazard ground that doesn't affect you till you turn on the crystal switch, you'll encounter "the Purple Haired Demon". Defeat her once and you'll get the H book, which is in your inventory, infinite use, showing a random H CG and gives Saki Horny Status (great for unlocking Lesbian acts with Mikoto). Lose to the Demon 3 times for scenes.
It still works for me.
