Just like my forum title said. when i wanted to add more it says : These are the best items in all of Subeta!

MukMuk's Treasure Chest 3 out of 3 Treasure Chest slots are filled.

does anyone know how to add more, or is that it ... three slots.... :/

@ x3taro You can buy Magical Keepsake Boxes to add more slots c: And extra slots can also be added through random events and quests and such.

thank you very much xD ( i feel so dumb )

from the Millionaire Center 1-3 extra slots. or from the Cash Shop or user shops.