Bull Pulu, the tapioca drink shop, is teaming up with coly Inc.'s smartphone app game Promise of Wizard for a collaboration campaign at Bull Pulu locations starting September 25, 2026.
Campaign Overview
Promise of Wizard x Bull Pulu Collaboration Campaign
- Period: 12:00 PM on Friday, September 25, 2026, to Sunday, October 18, 2026
- Stores: All Bull Pulu locations
- Collaboration page: https://bullpulu.com/mahoyaku-bullpulu/
Collaboration Menu
Collaboration drinks themed on the countries the sage wizards belong to, along with Taiwanese castella themed on Sacrificium (サクリフィキウム), will be available.
Anyone who orders a collaboration menu item will receive one collaboration-exclusive coaster (1 of 21 designs, chosen at random) per item ordered.
Drink exchange tickets are also planned; see the collaboration website for details.
Collaboration Goods
For this collaboration, mini character illustrations of the 21 sage wizards were newly drawn around the theme of "Bull Pulu-colored diner-style outfits," and a range of goods featuring these illustrations will go on sale.
In stores, for every 2,200 yen (tax included) spent on collaboration goods, customers will also receive one collaboration-exclusive illustration card (1 of 10 designs, chosen at random) as a gift.
Collaboration goods will also be sold through the online shop (GK Store) starting at 12:00 PM on September 25 (Fri).
Online shop (GK Store): https://www.store-gk.com/
- Purchases made through the online shop are not eligible for the bonus gifts.
- These goods may also be sold at non-collaboration stores after the campaign period ends.
- Collaboration goods can only be purchased alongside a collaboration menu item; goods-only purchases are not available.
Collaboration Decorations
Panels featuring the mini character illustrations will be displayed in stores, with the wizards on hand to welcome guests.
Check the collaboration website for which stores will have the decorations.
Promise of Wizard App Login Bonus
Logging into the Promise of Wizard app between 4:00 AM on Friday, September 25, and 11:59 PM on Sunday, October 18, 2026, unlocks a special collaboration login bonus.
Rewards:
Day 1: Hinyari Ever Milk (ひんやりエバーミルク) x 3
Day 2: Air no Ha (エアの葉) x 3
Day 3: MP Chiryoyaku (Small) (MP治療薬(小)) x 3
The login bonus can be claimed once per day, during the window from 4:00 AM to 3:59 AM the following day.
See the in-app notice in Promise of Wizard for further details.
Notes
- On the first day of the collaboration only, menu and goods sales at all stores will begin at 12:00 PM.
- All images are for illustrative purposes only.
- See the collaboration website for full details, notes, and participating stores.
- Details are subject to change without notice.
About Promise of Wizard
"Nice to meet you, Sage. Welcome to this crumbling world."
Promise of Wizard is a game about forming bonds with wizards, in which you guide them to save the world from the Great Calamity. It has surpassed 8 million downloads and also received an anime adaptation in January 2025.
What traits the wizards have and how they grow is entirely up to you, the Sage. The story follows a single Sage summoned to another world and the 21 wizards bound to them, depicting a group portrait of complex, individual characters who, despite their special standing, carry an unending role.
