Mos Food Services, the company behind Mos Burger, will offer collaboration freebies featuring Bandai’s beloved digital pet Tamagotchi with its kids’ Mos Waiwai Set starting Wednesday, July 15, 2026, at Mos Burger locations nationwide in Japan (some stores excluded). Available for a limited time and in limited quantities, this is the second Tamagotchi collaboration of the summer, following the 2026 Summer Lucky Bag.
Second Summer Collab with Tamagotchi as It Turns 30
First released in 1996, Tamagotchi is a long-selling digital pet that celebrates its 30th anniversary this November. Its fanbase spans young children, teens and twenty-somethings who love all things cute, and parents who grew up playing with it. After the first collaboration last spring proved hugely popular, a second one was greenlit. This time, the freebies feature original newly drawn illustrations combining the world of Tamagotchi Paradise — a major hit released last summer — with Mos Burger menu items.
Four Collab Freebies to Choose From
- Tamagotchi Sparkly Sticker Set (9 stickers): eye-catching holographic stickers
- Tamagotchi Mini Clear Case: comes with a ball chain
- Tamagotchi Letter Bag: fits A5-size items
- Mametchi Ballpoint Pen: topped with a puffy Mametchi rubber plate
Customers can pick one freebie of their choice with the purchase of an eligible set. Freebies are not sold separately, and availability varies by store inventory.
Eligible Menus and Prices (Tax Included)
Mos Waiwai Set (560–680 yen)
The set combines a burger or nuggets, small French fries, a drink, and a freebie. Choose from the Waiwai Mos Cheeseburger, Waiwai Burger, Waiwai Cheeseburger, Waiwai Teriyaki Burger, or Waiwai Nuggets. Drink options are apple juice, Cold Drink S Orange Blend 100 S, or Mos Shake S (+50 yen).
Low-Allergen Menu Set with Drink and Freebie (610 yen)
The low-allergen menu avoids the eight major allergens (egg, milk, wheat, shrimp, crab, buckwheat, peanuts, and walnuts) as ingredients. Choose from the Pork Sandwich (rice flour) or Pork Roll (rice flour), served with a drink and a freebie. Note that the patty and sausage contain pork, and the accompanying reduced-salt ketchup packet contains apple.
Campaign Period and Participating Stores
- Period: Wednesday, July 15, 2026 through late September — limited quantities, while supplies last
- Stores: Mos Burger locations nationwide in Japan (some stores excluded)
When ordering online, your preferred freebie may be out of stock at the pickup store. This family-friendly collab is a perfect treat for summer outings — check it out before the freebies run out.