The melancholy of Physics-tan!? (episode 4)

''Oh no! It seems I have the melancholy because I was sad quietly to this user. Everything's ruined because of the subjects! Sorry to say that, but I can't!''

Physics-tan is having trouble, and has the melancholy and she has deep sadness to the user without being supported. Will the subjects have to say sorry before they are friends again?

It is the fourth episode of Trouble Math (series).