Crossover: Saiki Isn't Happy

When Kusuko Saiki opened her eyes, she was in a rare state of utter confusion.

#Who am I? Where am I? What am I doing?#

Then she was told:

Become popular, girl! Make everyone happy! Go save (win over) this world! You can go home once you have enough world power

Kusuko Saiki coolly took off her hair clips. "Speak plainly."