Thank you for playing and your detailed report!
That line of the job guide is a subtle reference of a future update, I plan to make the job done in the construction site useful in order to unlock new buildings, for now I only have one new building in mind but I don't know when will I implement it!
Right now the VR World is unavailable and it doesn't depend on the construction, I should hide the option until I create that content.
I just checked, the Extra Large option had an error and it only unlocked if you took the Large drink with Cream, I will release a fix for that soon.
I'll think about that, Diane loves draining attributes so it may happen!
You are right, the Draining Grounds side characters don't have a gallery space yet, I'm thinking about a good way to count and show them, I'll probably add it in a future update.
I just fixed the broken image in Diane's gallery, and the image of her using the pajamas while smaller will be fixed soon too.
The rented books can be rented at will so I didn't have plans to add their images to the gallery, If I find that this is a big inconvenience for the players I may change my mind and add them too.
I deactivated the "undo" button because it makes every game slower (when it exists the game needs to make a temporal save at each action in order to remember a good amount of "game states"), I prefer to keep it deactivated.
Thank you again for the detailed comment, I'll release the fixes as soon as possible!