Only a limited run of the Black Thunder Cake Christmas set is available from Yuraku Seika in Japan. The seasonal campaign adds a Christmas melamine plate, a festive sleeve, and a crunchy topping to the popular cake.
The second campaign runs from November 2 through December 25, 2026, at 3:00 p.m., through Yuraku Seika’s official online shop, official Rakuten store, and official Yahoo! store. The melamine plate is available while supplies last, so the campaign may end early.
The Black Thunder Cake costs ¥2,980 (tax included) through the official online shop, ¥4,260 (tax included) through the official Rakuten and Yahoo! stores, and ¥1,980 (tax included) at Yuraku Seika’s direct stores. The first campaign, running October 1–28, offers ¥500 off the regular price.
About the Black Thunder Cake
Black Thunder Cake
The six-layer Black Thunder Cake combines crunchy biscuit with ganache and two types of chocolate mousse. It costs ¥2,980 (tax included) through the official online shop, ¥4,260 (tax included) through the official Rakuten and Yahoo! stores, or ¥1,980 (tax included) at direct stores.

Six-layer chocolate cake
The cake layers include chocolate glaze, chocolate mousse, milk chocolate mousse, crunchy biscuit, ganache, and cocoa sponge. The biscuit is chocolate-coated to help retain its crunch inside the frozen cake.

Tokyo Factory Direct Store
The YURAKU CHOCOLATE SHOP Tokyo Factory Direct Store in Kodaira is open from 9:00 a.m. to 5:00 p.m. The Black Thunder Cake is ¥1,980 (tax included) at direct stores.

Toyohashi direct store
Wakuzaku SHOP at the Toyohashi Yume Factory is open from 10:00 a.m. to 5:00 p.m. The Black Thunder Cake is ¥1,980 (tax included) at direct stores.

The four-inch cake measures approximately 12 centimeters in diameter and is delivered frozen. Its six layers combine chocolate glaze, two chocolate mousses, crunchy biscuit, ganache, and cocoa sponge. A chocolate coating helps protect the biscuit from moisture, preserving the signature crunch while giving the cake a smoother overall texture.

Highlights
- One Christmas melamine plate is included with each Black Thunder Cake purchased during the second campaign, while supplies last.
- The cake has sold more than 20,000 units since its October 2024 launch and has an official online-shop rating of 4.64 out of 5 from 229 reviews as of October 2026.
- The second campaign includes the Christmas plate, a crunchy topping, and a Christmas-design sleeve.
- The first campaign offers ¥500 off the regular price from October 1 through October 28, 2026.
- The cake is available online and at Yuraku Seika direct stores in Kodaira, Tokyo, and Toyohashi, Aichi.


Menu and Campaign Details
| Item | Details |
|---|---|
| Name | Black Thunder Cake Christmas campaign |
| Menu / items | Black Thunder Cake, Christmas melamine plate, Black Thunder crunchy topping, Christmas-design sleeve |
| Period | First campaign: October 1, 2026 – October 28, 2026; second campaign: November 2, 2026 – December 25, 2026, at 3:00 p.m., while supplies last |
| Location | Yuraku Seika official online shop, official Rakuten store, official Yahoo! store, and Yuraku Seika direct stores |
| Stores | Yuraku Seika Official Online Shop; Yuraku Seika Official Shop Rakuten Store; Yuraku Seika Official Shop Yahoo! Store; YURAKU CHOCOLATE SHOP Tokyo Factory Direct Store; Wakuzaku SHOP Toyohashi Yume Factory Direct Store |
| Address | YURAKU CHOCOLATE SHOP Tokyo Factory Direct Store, Kodaira, Tokyo Wakuzaku SHOP Toyohashi Yume Factory Direct Store, Toyohashi, Aichi |
| Price | Black Thunder Cake: ¥2,980 (tax included) at the official online shop; ¥4,260 (tax included) at the official Rakuten and Yahoo! stores; ¥1,980 (tax included) at direct stores; first campaign discount: ¥500 off |
| Official website | Official online shop |
Before you buy
- When can I buy the Black Thunder Cake Christmas set?
- The second campaign starts on November 2, 2026, and runs until December 25 at 3:00 p.m., while supplies last. The first ¥500 discount campaign runs from October 1 through October 28, 2026.
- How much is the Black Thunder Cake?
- The cake costs ¥2,980 (tax included) online, ¥4,260 (tax included) through the official Rakuten and Yahoo! stores, or ¥1,980 (tax included) at direct stores.
- Where can I get the Black Thunder Cake?
- It is sold through Yuraku Seika’s official online shop, official Rakuten store, official Yahoo! store, and two direct stores in Kodaira and Toyohashi.
- Does the cake need to be frozen?
- Yes. It is delivered frozen and should be stored in a freezer at -18°C or below.