The Barcode Fighter comic series was inspired on the Barcode Battler game series.
Barcode Fighter Cards
The Barcode Fighter Cards is a set of 30 Barcode Fighter themed cards to use with the Barcode Battler II console.
That's considered an in-universe link because this way characters from the Barcode Fighter series can virtually fight original Barcode Battler enemies.
Shogakukan was licensed by Epoch to release Barcode Fighter-themed Barcode Battler cards.