"the most delicious hentai soda on the market"

Tentacle Grape is an actual product, American, but inspired by Japan:

"Tentacle Grape is everything I love about hentai, but with a sweet grapey taste that makes it seem like everything's going to be okay." - Yuri Lowenthal, beloved anime voice-actor

From their About page: Tentacle Grape is now available... so WATCH OUT! You gonna get GRAPED!