This game is extremely confusing. There is a beat meter on the bottom as you fight, but it does not seem to actually do anything (or at least pressing 'select' whenever the red heart crosses a white one does not seem to have any effect), unless I'm missing something?
EDIT: I did some DeepL spelunking of the DLsite comments for this game, and apparently the beat meter in fact does not do anything, it's just there for... flavor? Like, you can jerk off to the beat or the animation's rhythm in literally any porn game, so what is the point?? Why would you make the standout feature of your game that you showcase everywhere have no mechanical significance??? The World wonders.