Yuno is one of the three skins released in the Meme Mania offer. It could be purchased as part of an item deal in early December 2017.
Yuno could be purchased for $9.99 in a deal that included 16000 coins. It was not available for individual purchase and may not be available for purchase in the future.
Details of this skin can vary depending on location, platform or time.
Note: Yuno was released again for a limited time as part of the All the Internet Things offer in mid November 2019. This time Yuno could be purchased individually for 6700 coins.