Black Thunder's sister 'Sweet Thunder Strawberry Cake Flavor' taste review, where the creamy sweetness matches the sourness of strawberries

From the Black Thunder series, the ' Sweet Thunder Strawberry Cake Flavor, ' inspired by a shortcake topped with strawberries, will be available in limited quantities on June 24, 2025. Prior to the release, the Sweet Thunder Strawberry Cake Flavor was sent to the GIGAZINE editorial department, so we tried it a little earlier.

Yuraku Sweet Thunder Strawberry Cake Flavor | Product Information | FamilyMart

/ #Black Thunder new release
Black Thunder official little sister!? #Sweet Thunder strawberry cake flavor 🍰
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From Tuesday, June 24th, #FamilyMarts nationwide... pic.twitter.com/r6yzh2lUzg

— Black Thunder [Official] (@Black_Thunder_) June 19, 2025

Sweet Thunder strawberry cake flavour package.

The back side lists the names of ingredients, etc. Sweet Thunder Strawberry Cake flavor ingredients include wheat flour, semi-chocolate, and strawberry flakes.

Sweet Thunder Strawberry Cake flavour has 129kcal per 23g bar.

I took the Sweet Thunder Strawberry Cake flavor out of the bag and lined it up with the Black Thunder. The left is Sweet Thunder Strawberry Cake flavor, and the right is Black Thunder. The Sweet Thunder Strawberry Cake flavor is also coated with chocolate, but it is a little lighter in color and has a flatter appearance compared to the chunky Black Thunder.

We cut them and compared their cross sections. On the left is Sweet Thunder Strawberry Cake flavor, and on the right is Black Thunder. The Sweet Thunder Strawberry Cake flavor has a whitish cross section because its base is a 'fresh cream-like powder.' The Sweet Thunder Strawberry Cake flavor also contains the crunchy biscuits familiar from Black Thunder, but it also contains 'crispy butter cookies' and 'sweet and sour strawberry chips.' The red grains you can see in the cross section are strawberry chips.

When you put the Sweet Thunder strawberry cake flavor in your mouth, the powder melts smoothly in your mouth and the sweet flavor of the fresh cream spreads. It's not just sweet, but the sweet and sour taste of the strawberry chips matches the sweetness, so you can't help but eat it one after another. The texture is basically crispy, but the crunchy biscuits give it the distinctive texture of Black Thunder, so you can enjoy different textures and flavors with every bite.

Sweet Thunder Strawberry Cake flavor will be available in limited quantities at FamilyMart stores nationwide from June 24, 2025. The price is 60 yen excluding tax.