Nightmare Diary's Title Screen.
"Nightmare Diary is a currently in-development Yume Nikki fangame by Kayya and Tap. The main character is KNF, who has bloodstains all over him in the real world. In the dream world he is known as Ketsueki (血液, lit. Blood Liquid), and the bloodstains are removed.
There are 8 effects and 6 worlds as of V0.2."
(Source: Official blog's description)
Nightmare Diary plays like a typical fangame. You enter the dream world by sleeping in the bed. Interacting with the bookshelf allows you to save. Your main goal is to explore the dream world and obtain effects. There is plenty of dialogue in the game as well.
KNF appears to have confined himself to his bedroom to dream. There are bloodstains covering KNF's bedroom and KNF himself, the reason for this being unclear.
|Blade||KNF carries a blade as his weapon.|
|Shadow||KNF becomes a shadow. Allows him to talk to shadow NPCs.|
|Raincoat||KNF wears a yellow raincoat and it begins to rain. Pressing Shift makes thunder sound.|
|Wings||KNF has a pair of wings. His left wing is cut and bloodied.|
|Blood||KNF is covered in blood, just like how he is when awake.|
|Formal Wear||KNF wears formal attire. Pressing Shift makes him change between a groom and brides outfit.|
|Lights||KNF is covered in lights. Pressing Shift makes the screen tint red, green or blue.|