Cerasus is a Yume Nikki fangame created by SpectrumW, aka Mirabolantes-256, or Isasapiens, first released in June 2020 for the 4th annual Dream Diary Jam on Itch.io. Since then, it has received an update for the 5th annual Dream Diary Jam. It is currently still in development.
Plot
"You've been kidnapped.
[I know, such a way to start a letter.] "
Cerasus is unique in that its story has many direct explanations as to what is happening.
Reshnha has been kidnapped into the dream world by someone named the Blank Painter (aka, B.P.), as explained by Stomidori in their letter. In order to return to the real world, he must collect effects, songs, gummies, and dolls.