Music video for My Cherry Pie. It seems to be the first of her solo songs to not lyrically be directly about herself, but it's still about Aarin professing her love for another version of Aarin. I'm guessing My Hamburger Boy will be the response song to this one.
Unlike their previous solo songs, that have just been released as random songs, this will be an actual single, on par with Blast or The Golden History (albeit released by Ayaka Sasaki, and not Momoiro Clover Z, so therefore it will obviously not be as big and well promoted release). That's why it gets a video, and why there are b-sides, etc.
Well as Flowerwreck said, it's the only music video of a solo MCZ member! Plus the concept they went with was rather comical & I didn't think they actually would go all out to make an MV about it.
Plus, leave it to Aarin among all of the MCZ members to be the first member to have a physical single realease.