What are the twinkling stars in the constellation task of the pick-up hall and where do you get them?

The twinkling stars used to be sold (expensive) in shopping malls, but now they are not sold. You go to the mall opened by the player to have a look. You can eat fruit if you want to upgrade. The usual way to fight monsters (I don't like it very much) is to exchange silver coins for experience. If you learn fishing at level 25 (you can go to sea), it is best to go fishing, so you can get money, experience and skills. There is also planting flowers and fruits, which is also acceptable. The simplest! Only stand by and watch!