Manga Like Shinigami Doll

Case 2 Sachi is the top ranker in her grade, and works very hard for her scores. Despite of that she is miserable. Her parents are never impressed, she had no friends and on top of that, the guy she likes has a girlfriend. She often takes her anger out with her stuffed rabbit doll, Mimi. One day she was able to see Mimi in her dreams. From then on she assist Sachi, but why? Case 3 Tamaki is in love with her fellow art club member Ryouji, who has a girlfriend. She wishes that they would break up so she can be with him. And that's exactly what she got by receiving a doll from a stranger online. Even though she finally got what she wanted, but things received for free always have a catch, so what would that be?