At the current state the game is too buggy to complete fully. It's currently impossible to go beyond the first scene for each character, some animations don't play properly, ending scenes can't be replayed, just to name a few.
Very disappointing. Both Beelzebub and Pepperoncino have been releasing games with a plethora of bugs and some don't get fixed until after multiple dlc releases. I hope they fix their games soon. It looks like they peaked with their previous titles and their newer titles have been underwhelming at best with a higher price point. A real shame because I enjoy their games.