I was pretty confused how this quest worked at first, too.
The person above me explained Naomi's Invitation 1 very well. It's exactly like that.
Naomi's Invitation 2 is also a repeatable quest. It displays "100" as the completion requirement because that is the minimum amount you need to give her in order to get a prize back (100 = Change of Mouse (10)). If you bring her 700, for example, (Quest Helper will display 700/100) you'll be rewarded a better prize (700 = Necomimi). You can get as many rewards as you are able from Naomi, as long as the event goes on. For example, if you collect 1500 crystals, you can get a Moonstar Chair. And if you go and collect another 2000, you could get a Maple Tree Chair, too.
The person above me explained Naomi's Invitation 1 very well. It's exactly like that.
Naomi's Invitation 2 is also a repeatable quest. It displays "100" as the completion requirement because that is the minimum amount you need to give her in order to get a prize back (100 = Change of Mouse (10)). If you bring her 700, for example, (Quest Helper will display 700/100) you'll be rewarded a better prize (700 = Necomimi). You can get as many rewards as you are able from Naomi, as long as the event goes on. For example, if you collect 1500 crystals, you can get a Moonstar Chair. And if you go and collect another 2000, you could get a Maple Tree Chair, too.