The Depressed Patient Doesn't Want to Be a Dragon-Slaying Hero (Quick Transmigration)

The blurb isn't ready yet. I'll flesh it out later, but the core premise won't change.

The protagonist has depression. He goes from a cheerful little sun to a gloomy little mushroom.

One day, a System binds itself to him.

System: As long as you complete the overpowered protagonist missions, I can cure your depression!

Protagonist: Please, let me do it!

The protagonist and the System go from one mission to the next. He takes on all kinds of overpowered protagonist roles.

After a whole lot of effort, his depression gets better!

But then he develops bipolar disorder.

Protagonist: "."

Other worlds to be decided... They may not appear in the order listed in the blurb.

Theme: Wipe away your tears and keep living.