Duration: 07/24/18 - 4:00PM ~ 07/31/18 - 11:59PM JST
Complete the quests in the Hello Kitty Collab banner to earn rewards such as Hello Kitty (Milla costume) and Hello Kitty (Elle Costume) characters cards. Both are able to be awakened into 6 stars.
Conditions such as "Clear the quest 5 times" will unlock Elle or "Encounter Jude 3 times" will unlock Milla. You can track your progress in the event tab of the Missions page.
Completing the initial 2 missions will keep unlocking new ones as you clear the quests. Rewards range from food buffs, to materials for uncapping the Hello Kitty cards. These only last till July 31st, so grab them while you can!