If you still don't know why the portrait collection is 'missing', the Portrait Collection only appears if Variable 44 is greater/equal to 140, which you can learn more about right here https://yume2kki.fandom.com/wiki/Events#Variable_44_events
If you still don't know why the portrait collection is 'missing', the Portrait Collection only appears if Variable 44 is greater/equal to 140, which you can learn more about right here https://yume2kki.fandom.com/wiki/Events#Variable_44_events