Small tips:
- When exploring ruins, avoid Women shower room, there is monster inside, that will cause MC to run back to girl.
- Don't skip text too fast while exploring rooms, there is a bug that will cause you not to get items that were inside that room if you skip text too fast
- To prevent girl from running away you have to:
- Set up screens to hide girl from ppl (I think there is one in teachers room)
- Use elastic band on her to prevent her from screaming
- Combine 3 items (nails, cuffs and hammer) to lock girl legs in room
- feed her every 2 - 3 days, so she won't get too fit (she will run away otherwise)
- Set up screens, band and cuffs as fast as possible (if you don't do it, someone will wind her around day 4 or 5).
- Good ending requires you to impregnate her, after getting it, you unlock special mode, where you can do blowjob action on her and you get "constant birth mode". (no idea how it works, I got all requirements for good ending, yet it was still bad one)
- And if anyone want to cheat a bit, start game, save and go to (C:\Users\username\AppData\LocalLow\DefaultCompany\肉遊び\SaveData), here you have save files from the game, open savedata1.json (with any text editor), find "Yokubou" and change its value to any number of points you want. This changes amount of desire you currently have, allowing you to skip the grind.
EDIT. You can only use objects found during exploration, while being on exploration screen! (boxes, screens, band, cuffs, nails and hammer). WHen you open box, that item will be usable during interaction with girl.