PRE REGISTER event for upcoming episode. If you pre register before 12th May. You will receive 100 crystals and Choux Cream Cookie for free after the update.
To pre register go to the link below. All the instructions are in Japanese but don't worry I'll help you:
https://game.line.me/pr/cookierun/ja
1. Click the link above
2. Tap the Orange button
3. Login to your line account you use for cookie run
4. Type in the same email you use for your line account, tap the green button
5. Check your email is correct, and tap the green button.
6. You've finished.