Engi Threepiece

"Garden" Engi Threepiece is a dream demon who requires a vessel to access the real world. She wants to avenge her older sister, who was tricked into going to the real world and ended up being killed there. Engi thus asked Yui's help. Engi wants to punish the Dream Demons that may have killed her elder sister, Patty, who she loved very much and blames herself for her elder sister's death. She is also very brave and proud. She is an avenger who does not hesitate when pursuing her goals, however, she does not want to get humans involved in her battles as shown when she told Yumeji to take cover whilst she was about to battle Merry.