This is a FCS-only head mold. This is the Sweet Dream (abbreviated SWD) version of the MSD-F33. It was released on October 7, 2018 for the Autumn update to the Tenshi no Sato FCS. This head is currently only available at Tenshi no Sato. It had a limited release at Tenshi no Mado from June 19th through August 29th, 2021.
Please click on the individual thumbnails to see the pictures full-sized.