モブのおそ松ガール可愛いから描いた。笑（気持ちわかる）

I drew the Osomatsu Girl extra because she looked cute, lol. (I know how you feel!)
Fans of a specific sextuplet are referred to as [X] Girls, thanks to Karamatsu's habit of referring to his imaginary love interests as "Karamatsu Girls".