In this collaboration, the girls from Kessoku Band of the franchise Bocchi the Rock! They appear standing accompanied by the text «If you are under 20, you definitely shouldn't smoke!». However, the protagonist Hitori Gotou appears with a gloomy expression while the other girls appear smiling. Franchise connoisseurs know that his expression is likely due to Bocchi's own social anxiety, not knowing how to act now that he's on a billboard.

However, the problem arose when those unfamiliar with the franchise looked at the ad and analyzed it. Since these people don't know that Bocchi suffers from social anxiety, they assume she has this expression because the ad is dedicated to her. I mean, in the Kessoku Band, Bocchi is the smoker and she has that expression because she knows she's doing the wrong thing.

This amusing situation attracted comments on comment forums in Japan:

• «Oh no, Bocchi-chan did it again!».
• «I don't know, I think even those who know Bocchi will think that the ad is dedicated to her.».
• «People with social anxiety are the first to pick up dangerous habits, so Bocchi is likely to start smoking before his friends.».
• «In my experience as a school teacher, the most correct boys and girls are the first to acquire vices.».
• «I think Yamada would be the first to start smoking, I think it suits her personality».
• «No, the blonde on the right would definitely smoke first.».

Source: otakomu