One time purchase?

[Felis]

Currently buying Fantasia work like registering a bonus item.
Because you can't register the same bonus item twice, they sell the Fantasia in different versions (1, 3 and 5) until they worked on it so it don't need to work like bonus items (sending it to a specific character instead to register it for the whole account).

Of course they could have done it with selling just 1 with changed purchase name, like "1 Fantasia 1st purchase", "1 Fantasia 2nd purchase" until "1 Fantasia 9th purchase", but it would just clutter the bonus item list at the end