Ferry from Germany, (maybe Kiel?), to Aero, Denmark

Hi,

I'm coming via train from Amsterdam to Denmark and am obsessing over Aero. I think it makes more sense to train to Germany from A'dam, ferry over to Aero and then go on to Copenhagen rather than go all the way to Copenhagen from A'dam then over to the Island and then back again to Copenhagen where I'll depart back to Holland.

Someone posted that there is a ferry from Kiel, Germany to Aero but I cannot find the info. or any info. showing ferries from Germany to Aero. If someone knows about that route and has a link to send to me it would be awesome. Thanks so much for your help!