sexypants commented at 2022-05-28 01:20:13 » #2715455

According to the comments on Pixiv, this is a parody of "Baby on board" stickers on cars. It says "Middle school girl on board / riding", where "riding" is a double entendre.

16 Points Flag

sasamisa commented at 2022-06-17 06:47:31 » #2721126

Indeed, I've got a Touhou D.D.D. card showing Cirno dancing on a top with a big (9) on it featuring exactly the same slogan. The meaning also implies the person is "getting into the swing of things". (^_^)

6 Points Flag