What did Ryu do? Why is he grovelling? Because of a new series of collectible figurines.
As noted by Twitter user Bruce Hsiang, the series is called "Dogeza Strap" (土下座ストラップ), and the straps are for your smartphone or portable game devices.
"Dogeza" (土下座) is a type of bowing that's typically reserved for bowing before incredibly powerful people or for when asking for a huge favor, or even for forgiveness after a serious fuckup. As previously mentioned, it's "I'm sorry" for when simply saying "I'm sorry" won't cut it.