I would appreciate it if someone please spoils the endings for me in great detail.
The ending is the usual. Ken unaware while Millie and gramps carry on a hidden sexual relationship. Pretty boring so ill just summaries the plot for anyone who doesn't wanna bother with MTL
From what I can remember the plot is basically gramps pretending to be sick so he can have Millie attend to him while he sends Ken out to retrieve items to make a potion to recover Gramps but in reality they are like aphrodisiacs to make a cream so that he can have the drive to smash Millie and proceeds to fuck her and live together over a few days.
Here's a link to the gallery of the manga images the game was based on:
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TBH I could see this game taking place after HHI on a route where ken is still unaware of their relationship because...