Slap of Friendship Crewneck

ColorLight Grey

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Ever felt the urge to slap a friend, classmate, colleague, or some random bastard online? A slap that serves as a wake-up call, making them realize, "Damn, I really am a jerk," and then they proceed to shake your hand and apologize tearfully?

This crewneck takes inspiration from the Japanese horror manga master Kazuo Umezu's "The Drifting Classroom." We've bootlegged the iconic imagery but replaced the faces of the characters doing the slapping with Lora-chan from our SOFUBI series - Parallel Universe.

Product Specifications

  • Material: Heavyweight 420 gsm pure cotton fabric.
  • Heat Transfer Printing: Mimics the texture of comic book pages for a unique feel.
  • Shrinkage Control: Exceeds the national (GB) standard for first-rate products with less than 5% shrinkage.
  • Relaxed Fit: Designed for comfort and breathability.


  • Male Model is 176 cm / 5'9'' | 54 kg / 119 lbs wearing size M
  • Female Model is 174 cm / 5’'8'' | 50 kg / 110 lbs wearing size S

Shipping & Taxes

For US Customers: Tax-Free | Duty Fees May Be Assessed For Orders Over $800

For International Customers | Duties And Import Taxes May Be Collected Upon Delivery

Slap of Friendship Crewneck


UnDeR20 Story

UnDeR20 was founded on January 23, 2021 by the artist, TenGuSan. Since its establishment, we have been dedicated to the design and release of original toys, which have been widely recognized across Asia, in particular, Japan and China. In 2023, we started our own clothing and accessories lines because we felt that we couldn't find clothes that truly excited us anymore. So we are going to create them ourselves.

From toys to streetwear, just like our name suggests, we have always been "under 20 years old." We uphold our slogan, "Wandering Soul, Untamed Heart." We gather artists from around the world and always stand with the "wildest" young people. A revolution without dancing is a revolution not worth having, right?


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