Talk:Shop/@comment-25927310-20141228121235/@comment-25390763-20150114024139

http://kancolle.wikia.com/wiki/Morale/Fatigue#Food_Supply_Ship_.22Irako.22

According to this, Mamiya removes fatigue and Irako makes your ships sparkle. So if your fleet's morale is not low, using Irako alone will sparkle your fleet. I've never used them, so I can't confirm.